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