Here is the full list of all 23 Freedom Fall achievements.
Get cog, time and death par for all levels
Get over cog par for every level
Get the dragon ending.
Complete the game on Hard mode
Get the solo ending.
Complete game without buying any equipment
Complete the not-guilty path in level 11.
Kill the shark boss.
Get the princess ending.
Complete the game.
Pass the game without dying.
Get under time par for every level
Get under the death par for every level
Complete the guilty path in level 11.
Complete Chainmoor
Beat the princess in a race section.
Escape the shark boss.
Complete Bombard
Buy all the equippable items in the shop.
Kill yourself with a bomb.
Pass a level without dying.
Collect 50 large gears.
Enter a no-boys-allowed zone.