Here is the full list of all 29 Paperman: Adventure Delivered achievements.
Collect all envelopes on the island.
Collect all envelopesin the desert
Collect all envelopes in the mountains.
Collect all parcels on the island.
Collect all parcel in the desert.
Collect all parcels in the mountains.
Collect all quills on the island.
Collect all quills in the desert.
Collect all quills in the mountains.
Collect all notepapers on the island.
Collect all notepapers in the desert.
Collect all notepapers in the mountains.
Collect every golden letter on the island.
Collect every golden letter in the desert.
Collect every golden letter in the mountains.
Collect every hidden letter on the island.
Collect every hidden letter in the desert.
Collect every hidden letter in the mountains.
Talk to every Mailperson.
Get burned for the first time.
Drown for the first time.
Fall into the clouds.
Defeat 25 inhabitants of Manyfaced Island.
Defeat 25 inhabitants of the Valley of Sand.
Defeat 25 inhabitants of Winding Peak.
Beat the boss on the island.
Beat the boss in the desert.
Finish the main story.
Collect EVERYTHING.