Here is the full list of all 100 Choco Pixel X achievements.
Level 50
Symbol 24
Level 49
Symbol 23
Level 48
Symbol 22
Level 47
Symbol 21
Level 46
Symbol 20
Level 45
Symbol 19
Level 44
Symbol 18
Level 43
Symbol 17
Level 42
Symbol 16
Level 41
Symbol 15
Level 40
Symbol 14
Level 39
Symbol 13
Level 38
Symbol 12
Level 37
Symbol 11
Level 36
Symbol 10
Level 35
Symbol 9
Level 34
Symbol 8
Level 33
Symbol 7
Level 32
Symbol 6
Level 31
Symbol 5
Level 30
Symbol 4
Level 29
Symbol 3
Level 28
Symbol 2
Level 27
Symbol 1
Level 26
Z
Level 25
Y
X
Level 24
Level 23
W
Level 22
V
Level 21
U
T
Level 20
S
Level 19
Level 18
R
Level 17
Q
P
Level 16
O
Level 15
Level 14
N
Level 13
M
Level 12
L
Level 11
K
J
Level 10
Level 9
I
H
Level 8
Level 7
G
Level 6
F
Level 5
E
Level 4
D
Level 3
C
Level 2
B
Level 1
A