Full list of all 10 Dark Sheep achievements.
The base game contains 8 achievements, and there is 1 DLC pack containing 2 achievements.
Finish Chapter 1
Finish Chapter 2
Finish Chapter 3
Finish Chapter 4
Get PAR in all levels
Finish Chapter 5
Finish Chapter 6
Get PAR in all Aftermath levels
Finish the Master Chapter
Get PAR in all Master levels