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