Here is the full list of all 27 Leave Me Alone achievements.
Kill the Alpha
Collect 35 skates!
Kill the Flaming Insane
Kill the temle guardian
Destroy the mothership
Get the maximum vitality
Kill the acrobats
Kill the illusionist
Destroy all hearts of the Great Devourer
Kill the lumberjack chief
Collect 15 skates!
Jump from the train and survive
Kill the hungry mad pet
Kill a reptile in the sewers
When you can not, but really want
Collect 250 smiles!
What do parents think?
Buy the ticket, take the ride
Just for kids
Collect 50 smiles!
Kill the last boss
Get the maximum power
Get the maximum critical
Collect 500 smiles!
Collect 1000 smiles!
Collect all skates!
Sweet revenge for passcode