Here is the full list of all 11 Sloth Quest achievements.
Find 7 lost items.
Find 17 lost items.
Find 27 lost items.
Find 37 lost items.
Find 47 lost items.
Find and finish secret level.
Choke 10 snakes in a single level.
Beat the Snake King.
Beat the Balrog.
Beat Wasper.
Blast-off.