Here is the full list of all 51 Glitch Pets achievements.
Elephant_Crossing
Flowers Have No Checkpoints
Not Enough Checkpoints
Behind the Great Visible Invisible Wall
on F2
Tear in the Surf Fabric
Beat Surf Build S13
A Special Bouncy-Spot
Sky-Boxing
Beat Adv Build LB7
Find a Hideout
Were Those Solid..?
On a Plateau
On a Mountain
Talk to SquiitheFish
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
S
T
U
V
W
X
Y
Ican Ipex
Z
MountainWalking
L0_ Out Of Bounds
Surf a Sprite
On Top of Old FlatRocks
Rat Rocket
Quiet! Zombie Kitten!
Up the Untextered Ramp to Legacy
Down and Out
R
OneFullEmpty Flower Bounce