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