Here is the full list of all 12 Imagine Me achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Defeat Three Bosses
Defeat Two Bosses
Defeat One Boss
Complete One Story Page
Pick lock your first door
Complete All Challenge Levels
Complete 50% of the Challenge Levels
Fall for the 15th Time
Jump on a Trampoline 100 times
Begin a Dungeon in Campaign
Falling into the Darkness
Move a Crate. Have an Achievement.