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