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