Here is the full list of all 30 Mice Tea achievements.
Finish any of the main paths
Complete the main Sylvia ending
Reach out to your new self
Be hypnotized for the first time
Get as mousey as you can
Help your friend find herself
Meet the mean red vixen
Hear what the cats have been saying this whole time
Unlock all gallery images
Unlock all gallery images in the Felicia Path
Unlock all gallery images in the Gavin Path
Unlock all gallery images in the Julie Path
Unlock all gallery images in the Sylvia Path
Unlock all the NPC sprites in the Character Viewer
Unlock all the character outfits in the Character Viewer
Stay on the Music screen for one hour
Meet the assiduous sow
Meet the skittish squirrel
Meet the diminuative snow leopard
Complete the pre-furry café end
Complete the post-furry café end
Complete the first Gavin end
Complete the second Gavin end
Put a mouse in some tea
Complete the alt Julie ending
Find a rewarding career as a camgirl
Complete the main Julie ending
Complete the alt Sylvia ending
Get tied up for the first time
Make Margaret squeak