Here is the full list of all 21 Lair of the Clockwork God achievements.
Suffer through a wild goose chase
Just barely get a grip.
Get Everyone Killed
Make it through the final escape without dying
Comment on four invisible walls
Get a different kind of angry
Read all the Luxomails
Watch 100 splash logos
Teleport a very small distance
Input the colours code before you know it
The Army Of Daftness
Discover Balloon-Head's origin story
Kill 30 pinions
Give Ben both barrels
Get Hairy Palms
Taste all the flavours of lollipop
Make it through London without dying
Find the worst joke in the game
Turn Vi four colours
Beat the Choo-Choo Train
Look at you, so so clever breaking the rules.