Here is the full list of all 150 Chocolate makes you happy 6 achievements.
Z3
Level 50
Z2
Y3
Z1
Level 49
Y1
Y2
Level 48
Level 47
X2
X3
W3
X1
Level 46
W1
W2
Level 45
V2
V3
Level 44
Level 43
U3
V1
Level 42
U1
U2
Level 41
T2
T3
S3
T1
Level 40
Level 39
S1
S2
R2
R3
Level 38
Level 37
Q3
R1
Q1
Q2
Level 36
Level 35
P2
P3
Level 34
O3
P1
Level 33
O1
O2
Level 32
N2
N3
M3
N1
Level 31
M1
M2
Level 30
L2
L3
Level 29
Level 28
K3
L1
K1
K2
Level 27
J2
J3
Level 26
I3
J1
Level 25
I1
I2
Level 24
H2
H3
Level 23
G3
H1
Level 22
G1
G2
Level 21
F2
F3
Level 20
E3
F1
Level 19
E1
E2
Level 18
D2
D3
Level 17
C3
D1
Level 16
C1
C2
Level 15
B2
B3
Level 14
A3
B1
Level 13
A1
A2
Level 12
0c
Cookie
Level 11
0a
0b
Level 10
9a
9b
Level 9
8a
8b
Level 8
7a
7b
Level 7
Level 6
6a
6b
5a
5b
Level 5
4a
4b
Level 4
3a
3b
Level 3
2a
2b
Level 2
1a
1b
Level 1