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.
Spend 20 minutes listening to music on the desktop.
Draw boxes on the desktop.
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Achieve 100% data collection.
Review Paula's project plan.
Find Dan's special note.
Listen to a lot of what Monika has to say.
Finish all of the Side Stories.
Write a perfect poem for Yuri.
Write a perfect poem for Sayori.
Write a perfect poem for Natsuki.
Spend enough time during the poem minigame for the music to loop.
Delete Monika twice while getting deleted zero times.
Love, Monika
Ruin the game.
Choose not to quit DDLC.
Write a perfect poem for Monika.
Start a New Game.
Write a poem in 20 seconds or less.