To get all the achievements you need to collect 30 coins. I recommend collecting them all in one sitting because the counter seems to reset when you turn the game off.

There are 3 block types. There is the normal grass that does not do anything. Then there is ice, which causes your character to slide. You want to land on the far left of the block to survive it. However if you slide off once, it acts like a normal grass block when you respawn and you will not slide. Last there is a bouncy block that is yellowish steel colored. You need to land dead center with no east or west velocity to prevent bouncing off. I am convinced no mortal can do this however, so just trigger it once and it will act like a grass block next time. After 30 minutes you can get the hang of the physics and the jumps are easy except for the special blocks.

Just don't kill yourself trying to get all achievements; it is not worth it in the end. Just go play a better game and delete this. I actually would even recommend refunding if you can. There are multiple online phone apps that are very similar to this game. But if you do get stuck with the game like I did. Join me in ironically supporting it by making artwork and guides.