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