Here is the full list of all 100 Petty's Adventure: Desert achievements.
Level 50
z
Level 49
Z
Level 48
y
Level 45
Level 46
Level 47
W
X
Y
v
Level 44
Level 43
V
Level 42
u
U
Level 41
Level 40
t
T
Level 39
s
Level 38
S
Level 37
Level 36
r
Level 35
R
q
Level 34
Q
Level 33
Level 32
p
P
Level 31
o
Level 30
Level 29
O
n
Level 28
Level 27
N
m
Level 26
M
Level 25
Level 24
l
L
Level 23
Level 22
k
K
Level 21
Level 20
j
J
Level 19
Level 18
i
I
Level 17
h
Level 16
Level 15
H
Level 14
g
Level 13
G
Level 12
f
F
Level 11
e
Level 10
E
Level 9
Level 8
d
D
Level 7
c
Level 6
C
Level 5
b
Level 4
Level 2
Level 3
a
B
A
Level 1