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