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
v
Level 44
Level 43
V
Level 42
u
Level 41
U
Level 40
t
T
Level 39
Level 38
s
Level 37
S
Level 36
r
Level 35
R
q
Level 34
Level 33
Q
p
Level 32
P
Level 31
Level 30
o
Level 29
O
Level 28
n
Level 27
N
m
Level 26
M
Level 25
l
Level 24
Level 23
L
k
Level 22
Level 21
K
Level 20
j
Level 19
J
Level 18
i
Level 17
I
Level 16
h
Level 15
H
Level 14
g
Level 13
G
Level 12
f
Level 11
F
Level 10
e
E
Level 9
Level 8
d
Level 7
D
Level 6
c
Level 5
C
b
Level 4
Level 3
B
Level 2
a
A
Level 1