Here is the full list of all 32 Crowman & Wolfboy achievements.
Save your first baby.
Save half of the dark world babies.
Save all dark world babies.
Collect the big orbs in half of the dark world.
Collect the big orbs in all dark world levels.
Complete all dark worlds levels without losing a heart.
Destroy 50 bushes.
Destroy 100 trash bags or cans.
Kill 25 robots.
Earn 3 stars on Space-1.
Earn 3 stars on Portal.
Collect all 4 Dark Planet permanent hearts.
Find all collection objects in the Dark World.
Find all 3 Dark World pedestals.
Beat all Dark World levels.
Collect all extra points on all Dark World levels.
Have 500 total small orbs.
Have 1000 total small orbs.
Have 3000 total small orbs.
Have 10000 total small orbs.
Die 25 times.
Die 50 times.
Die 100 times.
Die 200 times.
Die 500 times.
Earn a Bronze medal in Infinite Rocket mode.
Earn a Silver medal in Infinite Rocket mode.
Earn a Gold medal in Infinite Rocket mode.
Kill 75 enemies.
Kill 300 enemies.
Kill 500 enemies.
Kill 1000 enemies.