Here is the full list of all 27 Poly Bridge 3 achievements.
Beat Classic Rock.
Beat Miner Mountains.
Beat Rustic Barrens.
Beat Bifrost Bend.
Beat Lava Lagoon.
Beat Vaulty Towers.
Beat Serene Cyclades.
Beat Desert Springs.
Beat Radical Melt-Town.
Beat Arctic Tundra.
Beat Twisted Turnpike.
Beat Forgotten Realm.
Unlock 2 Sheep Difficulty Worlds.
Unlock 3 Sheep Difficulty Worlds.
Unlock 4 Sheep Difficulty Worlds.
Unlock Secret Worlds.
Share a replay to Gallery.
Play a Workshop level.
Install a Mod.
Complete Classic Rock in five minutes or less.
Encounter 20 failures on a specific level (unique attempts).
Complete a level with only one piece that breaks.
Beat a level without failing.
Car ends up upside down after collecting flag.
Beat a hydraulic level without using hydraulics.
Beat a level in Desert Springs without using springs.