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