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