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.
Spend 20 minutes listening to music on the desktop.
Draw boxes on the desktop.
Find Dan's special note.
Finish all of the Side Stories.
Write a perfect poem for Yuri.
Write a perfect poem for Natsuki.
Review Paula's project plan.
Listen to a lot of what Monika has to say.
Write a perfect poem for Sayori.
Spend enough time during the poem minigame for the music to loop.
Delete Monika twice while getting deleted zero times.
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.
Love, Monika
Ruin the game.
Write a perfect poem for Monika.
Write a poem in 20 seconds or less.
Start a New Game.