Here is the full list of all 20 Tarek achievements.
The base game contains 10 achievements, and there is 1 DLC pack containing 10 achievements.
Complete level 10
Complete level 9
Complete level 8
Complete level 7
Complete level 6
Complete level 5
Complete level 4
Complete level 3
Complete level 2
Complete level 1
Complete level 20
Complete level 19
Complete level 18
Complete level 17
Complete level 16
Complete level 15
Complete level 14
Complete level 13
Complete level 12
Complete level 11