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