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