Here is the full list of all 26 MineStickman achievements.
This is A
This is B
This is C
This is D
This is E
This is F
This is G
This is H
This is I
This is J
This is K
This is L
This is M
This is N
This is O
This is P
This is Q
This is R
This is S
This is T
This is U
This is V
This is W
This is X
This is Y
This is Z