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.
Achieve 100% data collection.
Listen to a lot of what Monika has to say.
Draw boxes on the desktop.
Finish all of the Side Stories.
Find Dan's special note.
Delete Monika twice while getting deleted zero times.
Write a perfect poem for Sayori.
Spend enough time during the poem minigame for the music to loop.
Write a perfect poem for Natsuki.
Review Paula's project plan.
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.
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Write a perfect poem for Yuri.