Here is the full list of all 17 SokoLab achievements.
Complete The First 5 Levels
Complete Level 10
Complete Level 20
Complete 3 levels without using undo
Elevate a block using the red elevator
Replay a level
Discover the electrical system (enter stage 6)
Discover the switch system (enter stage 11)
Pass level 13 without activating any switches
Discover the system of levels and elevators (enter level 16)
Discover the automatic elevator (enter stage 21)
Disable an elevator by pressing Undo
Restart a level 20 times
Restart a level 40 times
Restart a level 60 times
Use Undo 40 times
Use Undo 80 times