Here is the full list of all 33 Betelgeuse achievements.
Complete chapter 15
Complete chapter 14
Complete chapter 10
Learn how to use your past
Destroy all pyramids
Complete chapter 13
Complete chapter 11
Play with paint
Complete chapter 9
Complete chapter 8
Complete chapter 7
Kill companion cube
Be brave with clocks
Connect symbols without wasting steps
Complete chapter 6
Complete chapter 4
Save some pyramids for later
Be faster on ice
Complete chapter 3
Complete chapter 2
Calculate level perfectly
Complete chapter 5
Complete chapter 1
Play with fire on full speed
Sacrifice companion cube
Finish the game
Complete chapter 16
Complete chapter 12
Complete chapter 17
Complete chapter 18
Take some shortcuts
Wait, it is impossible!
Dont let your companions to die