Wood Boy – Complete the Forest without dying.
Needle Boy -Complete the Hospital without dying.
Salt Boy – Complete the Salt Factory without dying.
Brimstone Boy – Complete Hell without dying.
Maggot Boy – Complete the Rapture without dying.
Dead Boy – Complete The End without dying.
Nostalgia – Unlock a single retro warp zone.
Living In the Past – Complete 5 retro warp zones.
Old School – Complete 10 retro warp zones.
Retro Rampage – Complete all retro warp zones.
The End – Beat the light world.
The Real End – Beat the dark world.
Golden God – 100% the game.
I Have Crabs! – Unlock the Head Crab (10 bandages).
Metal Head – Unlock the Machinarium Robot (30 bandages).
I Smell something Fishy… – Unlock Naija (50 bandages).
MS PAINT RULZ! – Unlock RunMan (70 bandages).
Vx6 – Unlock Captain Viridian (90 bandages).
Accidental Arsonist – Unlock Mr. Minecraft (100 bandages).
The Commander – Unlock Commander Video.
The Bootlicker – Unlock Jill.
The Jump Man – Unlock Ogmo.
The Fly Guy – Unlock Flywrench.
The Kid – Unlock the Kid.
There's also one achievement apiece for beating the secret levels, -1 through -6.
