Here is the full list of all 19 Lost Pixel achievements.
Play for 30 minutes in one go
Finish level 15
Finish level 14
Finish level 13
Finish level 12
Finish level 11
Finish level 10
Play for 20 minutes in one go
Play for 10 minutes in one go
Finish level 9
Finish level 8
Finish level 7
Finish level 6
Finish level 5
Finish level 4
Finish level 3
Finish level 2
Finish level 1
Booted up Lost Pixel