Here is the full list of all 54 Spiral Knights achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Defeat the Roarmulus Twins.
Earn clearance to explore Tier 3 of the Clockworks.
Use 10 Remedy Capsules.
Amass 10 helmets in your Arsenal.
Power up a derelict Mecha Knight.
Alchemize 10 items.
Alchemize a 3 star item.
Pay a visit to Emberlight, the town of gremlin outcasts.
Defeat the Royal Jelly squatting in the Royal Jelly Palace.
Alchemize 5 items.
Amass 5 shields in your Arsenal.
Alchemize a 2 star item.
Amass 10 guns in your Arsenal.
Alchemize a 4 star item.
Amass 3 bombs in your Arsenal.
Obtain a Firecracker bomb.
Amass 10 swords in your Arsenal.
Alchemize a 1 star item.
Amass 5 guns in your Arsenal.
Amass 5 armors in your Arsenal.
Amass 5 helmets in your Arsenal.
Amass 5 swords in your Arsenal.
Earn clearance to explore Tier 2 of the Clockworks.
Pay a visit to Moorcraft Manor.
Defeat the fabled Snarbolax that lives deep within the Gloaming Wildwoods.
Use 10 Health Capsules.
Amass 3 shields in your Arsenal.
Amass 3 guns in your Arsenal.
Amass 3 armors in your Arsenal.
Amass 3 helmets in your Arsenal.
Amass 3 swords in your Arsenal.
Revive a downed party member.
Revive yourself.
Reach the first Clockworks Terminal.
Cross the chasm into Haven.
Successfully reach the Rescue Camp.
Descend to the Core Terminal.
Defeat Lord Vanaduke in the heart of the Firestorm Citadel.
Alchemize a 5 star item.
Alchemize 25 items.
Alchemize 50 items.
Amass 5 bombs in your Arsenal.
Amass 10 bombs in your Arsenal.
Amass 10 armors in your Arsenal.
Amass 10 shields in your Arsenal.
Amass an Arsenal that includes a 5 star helmet, armor, shield, gun and bomb.
Build an item to heat level 10.
Unlock and fill every equipment slot.
Complete a Tier 1 expedition without having to revive.
Complete a Tier 2 expedition without having to revive.
Complete a Tier 3 expedition without having to revive.
Travel the entire Clockworks from depth 0 to depth 29 in a single expedition.
Travel the entire Clockworks from depth 0 to depth 29 in a single expedition without having to revive.
Hit an opponent with a snowball in Lockdown.