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