Here is the full list of all 51 Glitch Pets achievements.
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
Elephant_Crossing
R
OneFullEmpty Flower Bounce