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