Here is the full list of all 11 Squishy the Suicidal Pig achievements.
Complete all levels!
Kill the first 3 bosses on Hard mode!
Complete a speedrun in less than an hour
Kill the Big Bull-y on insane difficulty
Kill Jesse "Boom" Coyote on insane difficulty
Kill Frosty the Snowman on insane difficulty
Kill The Devil on insane difficulty
Kill all bosses on insane difficulty
Survive atleast 88 seconds in the survival minigame
Collect all the apples in game
Find the secret artifacts in space world