Full list of all 17 Only Down achievements.
The base game contains 10 achievements, and there is 1 DLC pack containing 7 achievements.
Complete the game
Anti-Only Down
Worthy reward (not sarcasm)
Meet the Buldiga
Sneak into Hell
Okay I pull up hop out at the after party
Find 10 apples
Find a wooden PC
An unfairly overlooked puzzle
Complete 10% of the game
Complete the game on HARD MODE
Complete World 2
Complete World 2 on HARD MODE
Find a home with Gabe Newell
Collect 10 Fuel Canisters