Here is the full list of all 11 Lost Snowmen achievements.
Kill first Deserter
Press the button by bomb
Use Hill's head as jump pad
Crush the wall by any possible way
Roll Yo by punching or exploding him
Drop the crate at Deserter's head
Feed Hill with bombs and watch how he flies to the sky
Punch Lord Fuse to make him fly
Let enemy walks across hiding Yo
Defeat all enemies at the level
Collect at least 10% of total fuel