Here is the full list of all 44 Nuclear Throne achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Unlock a Golden Disc Gun or Golden Nuke Launcher.
Reach Level Ultra as Skeleton.
Play as Frog.
Sit on the Nuclear Throne as headless Chicken.
We hereby sincerely apologize.
Unlock all Crowns as one character.
Defeat Captain.
Get 100% of the unlocks.
Loop as every character.
Reach 4-? as Crystal.
Reach the Nuclear Throne with Melting without choosing Rhino Skin or Strong Spirit.
Reach the Nuclear Throne in under 10 minutes as Plant.
Defeat the Technomancer as Steroids.
Defeat Mom as Rebel.
Defeat Hyper Crystal as Horror.
Defeat Captain as Rogue.
Unlock Hard Mode.
Die.
Reach 2-1.
Reach 3-1.
Reach 3-?.
Reach 6-1.
Reach 5-1.
Reach 5-?.
Loop past the Nuclear Throne.
Defeat Horror.
Reach the Nuclear Throne.
Reach 2-? as Eyes.
Reach 2-1 on Hard Mode as Chicken.
Unlock a Crown as any character.
Defeat Mom.
Defeat Hyper Crystal.
Defeat the Technomancer.
Unlock a Golden Weapon for every character.
Eat a Hyper Weapon as Robot.
Reach 7-3 on a Daily.
Defeat Throne II.
Loop the game.
Reach Level Ultra as any character.
Defeat the Nuclear Throne.
Unlock a Golden Weapon as any character.
Defeat Lil Hunter.
Defeat Big Dog.
Defeat Big Bandit.