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