Here is the full list of all 54 Spiral Knights achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Alchemize a 3 star item.
Pay a visit to Emberlight, the town of gremlin outcasts.
Defeat the Roarmulus Twins.
Alchemize 25 items.
Power up a derelict Mecha Knight.
Alchemize a 2 star item.
Alchemize 10 items.
Earn clearance to explore Tier 2 of the Clockworks.
Defeat the fabled Snarbolax that lives deep within the Gloaming Wildwoods.
Use 10 Remedy Capsules.
Use 10 Health Capsules.
Amass 10 shields in your Arsenal.
Amass 10 armors in your Arsenal.
Amass 10 guns in your Arsenal.
Amass 10 helmets in your Arsenal.
Obtain a Firecracker bomb.
Build an item to heat level 10.
Amass 5 shields in your Arsenal.
Amass 3 shields in your Arsenal.
Amass 5 armors in your Arsenal.
Amass 3 armors in your Arsenal.
Amass 5 helmets in your Arsenal.
Alchemize 5 items.
Amass 3 helmets in your Arsenal.
Amass 5 guns in your Arsenal.
Alchemize a 1 star item.
Amass 10 swords in your Arsenal.
Amass 5 swords in your Arsenal.
Amass 3 swords in your Arsenal.
Amass 3 guns in your Arsenal.
Amass 10 bombs in your Arsenal.
Amass 5 bombs in your Arsenal.
Amass 3 bombs in your Arsenal.
Reach the first Clockworks Terminal.
Revive yourself.
Cross the chasm into Haven.
Successfully reach the Rescue Camp.
Pay a visit to Moorcraft Manor.
Earn clearance to explore Tier 3 of the Clockworks.
Descend to the Core Terminal.
Defeat the Royal Jelly squatting in the Royal Jelly Palace.
Defeat Lord Vanaduke in the heart of the Firestorm Citadel.
Alchemize a 4 star item.
Alchemize a 5 star item.
Alchemize 50 items.
Amass an Arsenal that includes a 5 star helmet, armor, shield, gun and bomb.
Unlock and fill every equipment slot.
Revive a downed party member.
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.