Here is the full list of all 11 Cybel Playtest achievements.
Finish the tutorial
Unlock the WitchTrials mod
Finish the demo
???
Unlock all the coins
Unlock all the no shooting medal
Unlock all the no death medal
Unlock all the killing spree medal
Unlock all the time challenge medal
Go to the credit
Unlock all the medals from any level (Doesn't work with the tutorial)