Here is the full list of all 155 Risk of Rain Returns achievements.
Find the Artifact of Sacrifice.
Find the Artifact of Tempus.
Find the Artifact of Distortion.
Huntress: Defeat 3 unique event bosses in one run.
HAN-D: Obtain a golden drone.
HAN-D: Kill 15 enemies at once using the Sawmerang.
HAN-D: Kill 10 enemies simultaneously with FORCED_REASSEMBLY.
Loader: Kill the Overloading Magma Worm.
Find the 4 hidden Artifact Shards.
Loader: Travel 6,500 meters using the Hydraulic Gauntlet
Die 50 times.
Acrid: Spread 3,300 feet of caustic sludge.
Acrid: Spread Epidemic to 25 enemies.
Enforcer: Stay in Shield Mode for 5 minutes straight (in combat).
Mercenary: Beat the game on Monsoon difficulty.
Mercenary: Eviscerate 50 enemies.
Enforcer: Block 2000 damage total with your shield.
Complete the final Providence Trial as Engineer.
Complete the final Providence Trial as Huntress.
Complete the Providence Trial "A Duplicator?!".
Complete the Providence Trial "Equivalent Exchange". Alternatively: Complete 25 stages as Drifter.
Complete the Providence Trial "Perilous Descent". Alternatively: Collect 300 items as Drifter.
Kill 12 enemies simultaneously using the Gold-Plated Bomb.
Recycle 6 drones in one playthrough.
CHEF: Simultaneously kill 15 oiled enemies using SEAR/FLAMBE
CHEF: SEAR/FLAMBE 20 Sand Crabs
CHEF: Have 20 cleavers out at once.
Complete the Providence Trial "The Right Ingredients". Alternatively: Defeat 3,000 enemies as CHEF.
Complete the Providence Trial "Kited Blades".
Complete the Providence Trial "A Fresh Harvest". Alternatively: Collect 300 items as CHEF.
Complete the Providence Trial "Assassination Contract". Alternatively: Collect 300 items as Mercenary.
Complete the Providence Trial "Shadows of the Past". Alternatively: Defeat 3,000 enemies as Mercenary.
Complete the Providence Trial "Don't Think, Feel". Alternatively: Complete 25 stages as Mercenary.
Beat the game 5 times.
Obtain Meat Nugget, Bustling Fungus, Sprouting Egg, Bitter Root and Foreign Fruit in one run.
Unlock a golden chest with the Explorer's Key.
HAN-D: Beat the third stage without falling below 60% health.
Sniper: Beat the third stage without any players collecting items or equipment.
Sniper: 1-shot kill 10 enemies consecutively.
Sniper: Achieve 15 consecutive perfect reloads.
Bandit: Reset your cooldown 15 times consecutively.
Get a gold rank on at least 15 Providence Trials.
Complete the 1st stage in under 5 minutes.
Kill 8 Elder Lemurians without losing your Scorching status.
Use a health shrine that drops you below 5% health.
Miner: Survive the teleporter event without falling below 50% health.
Complete the Providence Trial "Uncontrolled Experiment". Alternatively: Defeat 3,000 enemies as Acrid.
Complete the Providence Trial "Caustic Climb". Alternatively: Collect 300 items as Acrid.
Complete the Providence Trial "A Toxic Path".
Find the illegal shipment.
Reach max barrier.
Engineer: Detonate 15 Bounding Mines within 5 seconds.
Obtain 7 Monster Teeth and 1 Guardian Heart.
Free the chained creature.
Use the same Equipment Activator 5 times.
Find the Artifact of Enigma.
Find the Artifact of Spite.
Survive in lava for 1 minute straight.
Engineer: Kill a boss in 15 seconds or less.
Huntress: Achieve 200% attack speed.
Complete the Providence Trial "A Rung Above".
Complete the Providence Trial "Routine Maintenance".
Complete the Providence Trial "Think of the Children".
Complete the Providence Trial "Main Systems Offline". Alternatively: Defeat 3,000 enemies as HAN-D.
Complete the Providence Trial "Break the Targets!". Alternatively: Complete 25 stages as Miner.
Get a gold rank on at least 5 Providence Trials.
Complete the Providence Trial "Gup Sorting?".
Complete the Providence Trial "Scorching Heart". Alternatively: Collect 300 items as Miner.
Complete the Providence Trial "Crash Landing". Alternatively: Defeat 3,000 enemies as Loader.
Complete the Providence Trial "Colossal Lift". Alternatively: Complete 25 stages as Loader.
Complete the Providence Trial "Ruins of the Future". Alternatively: Collect 300 items as Loader.
Complete the Providence Trial "Emergency Ejection".
Complete the Providence Trial "Juggling Priorities".
Complete the Providence Trial "Race to the Finish!". Alternatively: Collect 300 items as Pilot.
Complete the Providence Trial "In the Clouds". Alternatively: Collect 300 items as Artificer.
Complete the Providence Trial "Lightning Strikes Twice". Alternatively: Complete 25 stages as Artificer.
Complete the Providence Trial "Danger Orbits". Alternatively: Defeat 3,000 enemies as Artificer.
Complete the Providence Trial "From All Angles". Alternatively: Complete 25 stages as Engineer.
Complete the Providence Trial "Go On Without Me". Alternatively: Defeat 3,000 enemies as Enforcer.
Complete the Providence Trial "Get Off My Lawn!".
Complete the Providence Trial "Drowning in Research". Alternatively: Defeat 3,000 enemies as Engineer.
Deal 5000 damage in one shot.
Level up to level 20.
Find the Artifact of Spirit.
Clear a path for the survivor.
Purchase 40 drones total.
End a Teleporter timer with 0 enemies on the map.
Collect 15 Monster Logs.
Visit 10 unique stages.
Bandit: Kill a boss with 'Lights Out.'
Pass a shrine 4 times in a row.
Complete the Providence Trial "Scavenger Hunt". Alternatively: Collect 300 items as Enforcer.
Complete the Providence Trial "Inner Demons".
Complete the Providence Trial "Specimen Sampling". Alternatively: Complete 25 stages as Enforcer.
Complete the Providence Trial "Bullseyes Only". Alternatively: Complete 25 stages as Sniper.
Complete the Providence Trial "Meteor Showers".
Complete the Providence Trial "Lone Wolf".
Beat the game.
Kill the Scavenger.
Find the robot janitor.
Collect 4 Keycards.
Have 4 drone helpers at once.
Find the Artifact of Honor.
Bank 20,000 gold.
Reach 650 health.
Survive 40 minutes.
Obtain 30 unique items in one playthrough.
Find the bloated survivor.
Find the Artifact of Command.
Huntress: Defeat the Ancient Wisp without taking damage.
Kill the Magma Worm, Wandering Vagrant, and Colossus.
Find this item hidden somewhere in the world to unlock it.
Complete the Providence Trial "Highway Robbery". Alternatively: Collect 300 items as Bandit.
Complete the Providence Trial "Castle of Memories". Alternatively: Defeat 3,000 enemies as Bandit.
Complete the Providence Trial "Endless Stand-Off". Alternatively: Complete 25 stages as Bandit.
Complete the Providence Trial "Piercing Space and Time". Alternatively: Defeat 3,000 enemies as Huntress.
Complete the Providence Trial "Hot-Rope Hop".
Complete the Providence Trial "Blades in the Wind". Alternatively: Collect 300 items as Huntress.
Complete the Providence Trial "S.O.S.".
Complete the Providence Trial "Slide to the Finish!". Alternatively: Defeat 3,000 enemies as Commando.
Complete the Providence Trial "Brave Heart, Steady Hand". Alternatively: Complete 25 stages as Commando.
Complete the Providence Trial "A Colossal Feat". Alternatively: Collect 300 items as Commando.
Fail a shrine 3 times in a row.
Beat the 3rd stage.
Unlock a survivor.
Survive a boss with less than 20% health.
Defeat 20 Lemurians in one playthrough.
Commando: Dodge 7 lethal attacks.
Miner: Reach level 10 without getting hurt more than once.
Drown 20 Whorls.
Commando: Activate the 3rd teleporter without being hurt once.
Acrid: Kill Acrid in less than 15 seconds.
Sniper: Kill Providence while backflipping.
Drifter: Get 20 temporary items at once.
Pilot: Kill 30 enemies after launching them using Airstrike.
Pilot: Kill 10 enemies without touching the ground or geysers.
Artificer: Multi-kill 15 enemies.
Engineer: Acquire a Beam Drone.
Find the Artifact of Kin.
Find the Artifact of Glass.
Find the Artifact of Origin.
Find the Artifact of Cognation.
Complete the final Providence Trial as Artificer.
Complete the final Providence Trial as Drifter.
Complete the final Providence Trial as Acrid.
Complete the final Providence Trial as Commando.
Complete the final Providence Trial as Enforcer.
Complete the final Providence Trial as Bandit.
Complete the final Providence Trial as HAN-D.
Complete the final Providence Trial as Sniper.
Complete the final Providence Trial as Miner.
Complete the final Providence Trial as CHEF.
Complete the final Providence Trial as Mercenary.
Complete the final Providence Trial as Loader.
Complete the final Providence Trial as Pilot.