Here is the full list of all 90 Colors! achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
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Level !
Level 9
Level 8
Level 7
Level 6
Level 5
Level 4
Level 3
Level 2
Level 1
Level 0
Level Z
Level Y
Level X
Level W
Level V
Level U
Level T
Level S
Level R
Level Q
Level P
Level N
Level M
Level L
Level K
Level J
Level I
Level H
Level G
Level F
Level E
Level D
Level C
Level B
Level A
Level O