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