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