Here is the full list of all 19 Doki Doki Literature Club Plus! achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Find Dan's special note.
Finish all of the Side Stories.
Spend 20 minutes listening to music on the desktop.
Draw boxes on the desktop.
Write a perfect poem for Natsuki.
Write a perfect poem for Yuri.
Review Paula's project plan.
Delete Monika twice while getting deleted zero times.
Write a perfect poem for Sayori.
Love, Monika
Ruin the game.
Your desktop wallpaper could not be changed due to an administrative policy restriction on this computer. For more information, contact your system administrator.
Choose not to quit DDLC.
Listen to a lot of what Monika has to say.
Write a perfect poem for Monika.
Write a poem in 20 seconds or less.
Start a New Game.
Spend enough time during the poem minigame for the music to loop.
Achieve 100% data collection.