Estimated time to 100%: 80 hours.
Number of playthroughs: 2 complete playthroughs (campaigns) and 1 chapter.
Missable achievements:
- No One Noticed
- Blessing in Disguise
- Spy
- Trust No One
Difficulty related achievements: You have to beat the game on Hard difficulty.

Step 1: Complete any of the initial campaigns manually solving all secret files.
Focus on the missable achievements for this playthrough. You will have to complete the game again in Extended Mode so you can leave Hard difficulty for that playthrough if you prefer.

Step 2: Complete Chapter 1 of the other initial campaign on any difficulty.
If you completed the CIA Campaign before then complete Chapter 1 of the KGB Campaign and vice versa.

Step 3: Complete the Mossad Campaign in Extended Mode.
Extended Mode is unlocked by completing any campaign once. Choose Hard difficulty here if you didn't on the first playthrough.

Conspiracy Revealed
Solve a secret file.
Story related, cannot be missed.

Once Bitten, Twice Shy
Escape the Glasgow trap.
Story related, cannot be missed.

Bite the Bullet
Survive an ambush.
Story related, cannot be missed.

No One Noticed
Kidnap the Triad boss without raising alarm.
Missable Kidnap Tai-Pan during Chapter 3 without raising the alarm.

Note: You need a disguised agent with Actor perk and at least 4 other agents with silenced weapons. You will also need to get rid of the enemy agents in the map before going for Tai-Pan.

https://www.youtube.com/watch?v=vMuvco7FvTw
Thanks to Chris Jarvis for the video.

Rock the Boat
Recover the Marquis cargo.
Story related, cannot be missed.

Blessing in Disguise
Rescue the Opposition leader with the help of a disguised agent.
Missable You have to complete a mission during Chapter 4 which constists in rescuing an opposition leader with disguised agents and without raising the alarm.

Communication Noise
Attempt to save 269 lives from an aviation disaster.
Story related, cannot be missed.

Explosive Measures
Destroy the Broadsword facility.
Story related, cannot be missed.

Tip of the Iceberg
Get a taste of Beholder's real power.
Story related, cannot be missed.

Spy
Extract security data from Chicago's tallest tower.
Missable You have to complete the secondary objective during the mission in the tower in Chapter 7.



US Intelligence
As an agent of the CIA, verify whether your mentor's suspicions were correct.
Complete Chapter 1 of the CIA Campaign.

Comrade Spy
As an agent of the KGB, execute your top secret orders.
Complete Chapter 1 of the KGB Campaign.

The Institute
As the Israeli Nazi hunter, pay retribution to an old enemy.
Complete Chapter 1 of the Mossad Campaign.

Note: You have to complete the game once in order to unlock the Mossad Campaign.



Same, but Different
Recover the Marquis cargo from a different safehouse.
Complete Chapter 3 in Extended Mode.

Death of a Citizen
Kill the Beholder mastermind in Munich.
Complete Chapter 5 in Extended Mode.

The Whole Truth
Tie up the very final loose end.
Complete the secret mission after the credits in Extended Mode.



The End? - Easy
Dismantle the conspiracy on Easy difficulty.
Complete any campaign on Easy difficulty.

The End? - Normal
Dismantle the conspiracy on Normal difficulty.
Complete any campaign on Normal difficulty.

The End? - Hard
Dismantle the conspiracy on Hard difficulty.
Complete any campaign on Hard difficulty.

These are my recommendations:
- Agents should always travel in pairs.
- Investigate suspicious activities in the map as soon as possible.
- Keep your agents with the informants until the bar is at least at half.
- Use the Tactical Recon option before going to a tactical mission, this allows you to use disguised agents and reveals security terminals, loot and intel.
- Increase your agents' stats in the Body Engineering facility (focus on getting health and movement range, which is what you need for infiltration).
- Train your agents to get additional abilities and be able to use mods on weapons (my favourite training ability is Exertion, from Fire and Movement Tactics training).
- Keep infiltration status during tactical missions, avoid combat as much as possible.
- Get rid of enemy agents first if you need to clear the area (some missions require you to kill every enemy and if you start killing guards while enemy agents are still alive they will start chasing you).
- Choose perks carefully. Focus on those that help infiltration, like Survivor (Health), Faster Movement, and Actor (enemy agents can't identify you).

Trust No One
Complete all secret files manually in a single playthrough.
Missable Complete any campaign without assigning agents to the Analytics facility to solve secret files. You have to manually solve all of them yourself.

Tailor
Change an agent's identity.
Use the New Identity option in the Forger.

Blank Slate
Successfully brainwash an agent.
Use the Brainwashing option in the MK ULTRA facility.

Calculated Risk
Implant and successfully use a trigger phrase to your benefit.
Use the Control Phrase option in the MK ULTRA facility with a captured enemy agent and release him. Find that agent again during a tactical mission and use the Trigger Phrase ability to take control over him.

Inside Job
Destroy 5 enemy cells using sleeper agents.
Use the Saboreur option in the MK ULTRA facility with captured enemy agents and release them. After some time they will destroy enemy cells.

Misplaced Trust
Witness an agent betrayal during a tactical mission.
You need an agent with Beholder Sleeper Agent perk. Start combat during a tactical mission and watch how he joins the enemy on the next turn.

Syndicate Engineering
Engineer an agent with all stats at 140 or above.
Use the Body Engineering facility to improve an agent's stats by applying chemical compounds until his stats are at 140 or above.

Note: A very good way to discover new chemical compounds is to interrogate enemy agents.

Although it's not required for the achievement, you can look for the best chemical compounds sequences if you want to maximize the results:
https://phantom-doctrine.fandom.com/wiki/Body_Engineering

Top Tier
Have an agent reach maximum level.
You have to reach level 20 with any agent.

Note: You will reach the last mission of the game at around level 15, but you can ignore it and continue doing other tactical missions to get experiencie.

Cold Truce
Start a tactical mission with agents from CIA, KGB, Mossad, Stasi and SB in one team.
You need an agent from each of those backgrounds. Check the background of all agent candidates that you get and eventually you will find them all.

Fully Operational
Unlock all facilities.
The facilities are tech upgrades that can be researched in the Workshop.

Well-equipped
Research all tech upgrades in a single playthrough.
You have to research all tech upgrades found in the Workshop.

The following achievements are self-explanatory and most likely to be obtained during the first playthrough, except for some of them that may require an extra effort (especially the last one).

Lootcrates are Forever
Collect all loot and documents on a single tactical level.
You can check your progress on the left upper corner of the screen during pause.

Tactical Espionage
Find 50 secrets on tactical levels.


Tactical Plunder
Loot 50 containers on tactical levels.


Licence to Kill
Kill 15 agents.


Soldier
Kill 100 enemies.


Veteran
Kill 250 enemies.


Merchant
Buy 50 items.


Tinker
Craft 50 items.


Scientist
Apply 50 chemical compounds.
Use the Body Engineering facility to improve an agent's stats by applying chemical compounds 50 times.

Counterfeit Fortune
Forge $500,000.
You have to obtain a total of $500,000 in the Forger. This is cumulative between playthroughs, so you will most likely obtain it during your Extended Mode playthrough.

Pacifist
Finish a level in infiltration without hurting anyone.
You have to complete a tactical mission without raising the alarm and without hurting anyone (killing or knocking down).

Note: Tactical missions where you only have to interact with some objects are ideal for this. Use a disguised agent and ignore enemies.

Sadist
Kill six enemies in one turn.
Easy to do during the late game. Place your 6 agents so they see at least 6 enemies and kill them in one turn.

Note: Knocking down enemy agents doesn't count because they bleed out instead of dying instantly. If you want to instantly kill enemy agents you can use Breach.

Step into the Breach
Breach a room using four or more agents.
You have to use Breach with at least 4 agents at the same time.

Silent Power
Mod a shotgun with a silencer.
You need a shotgun, a shotgun silencer (it can be bought if you get the contract) and an agent with the required talent to use shotguns.

Airborne Extraction
Purchase helicopter evac for a tactical mission.
Once you get the Evac Chopper contract, buy a helicopter in the support powers section during a tactical mission preparation.

Tactical Support
Own at least one of each Support Power type in a single playthrough.


These are all the Support Powers:
- Cleaner
- Tactical Spotter
- Sweeping Spotter
- Evac Chopper
- Sniper (Silenced)
- Sniper (Loud)
- Smoke Screen
- Grenade Launcher
- Poison Gas Cloud
- Neurotoxin

Combined Arms
Use four support powers in one turn.
You need at least 4 support powers slots and 4 activable support powers.

Note: Support Powers require support points to be used, there are various tech upgrades related to this but they also increase every round, so you can just wait a few rounds to get the points that you need.