Here is the full list of all 28 Deskmate Girl achievements.
Start game.
Install DLC.
Date with Yui for 7 days.
Date with Yui for 30 days.
Date with Yui for 100 days.50
First see underpants.
See all kinds of underpants.
First see bras.
See all kinds of bras.
See all kinds of bras and underpants.
Collect 1000 coins.
Collect 2000 coins.
Collect 5000 coins.
Receive a grade of 120.
Receive an intimacy level of 120.
Flirt after snooping.
No organism for her.
Organism reaches top level together.
Endurance level reaches 4.
Energy level reaches 100.
Flirt with Yui.
First use drugs.
Buy swimsuit.
Buy gym clothes.
Buy cheongsam.
Buy maid dress.
Purchase all clothes.
Complete all accomplishiments.