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