Here is the full list of all 11 Feeble Light achievements.
Unlock 1 additional color palette.
Unlock 2 additional color palette.
Unlock 3 additional color palette.
Unlock 4 additional color palettes.
Unlock 5 additional color palettes.
Unlock 6 additional color palettes.
Unlock 7 additional color palettes.
Unlock 8 additional color palettes.
Unlock 9 additional color palettes.
Unlock 10 additional color palettes.
Unlock 11 additional color palettes.