Here is the full list of all 54 Spiral Knights achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Descend to the Core Terminal.
Travel the entire Clockworks from depth 0 to depth 29 in a single expedition.
Alchemize 50 items.
Earn clearance to explore Tier 3 of the Clockworks.
Defeat the Roarmulus Twins.
Alchemize a 4 star item.
Defeat the Royal Jelly squatting in the Royal Jelly Palace.
Alchemize 25 items.
Pay a visit to Emberlight, the town of gremlin outcasts.
Complete a Tier 2 expedition without having to revive.
Amass 5 bombs in your Arsenal.
Amass 3 bombs in your Arsenal.
Obtain a Firecracker bomb.
Amass 10 swords in your Arsenal.
Alchemize 10 items.
Amass 5 shields in your Arsenal.
Alchemize a 3 star item.
Amass 5 armors in your Arsenal.
Alchemize 5 items.
Earn clearance to explore Tier 2 of the Clockworks.
Complete a Tier 1 expedition without having to revive.
Defeat the fabled Snarbolax that lives deep within the Gloaming Wildwoods.
Amass 5 helmets in your Arsenal.
Use 10 Remedy Capsules.
Amass 5 guns in your Arsenal.
Alchemize a 2 star item.
Amass 3 armors in your Arsenal.
Amass 3 shields in your Arsenal.
Alchemize a 1 star item.
Amass 5 swords in your Arsenal.
Amass 3 guns in your Arsenal.
Build an item to heat level 10.
Use 10 Health Capsules.
Cross the chasm into Haven.
Amass 3 swords in your Arsenal.
Amass 3 helmets in your Arsenal.
Pay a visit to Moorcraft Manor.
Revive a downed party member.
Reach the first Clockworks Terminal.
Revive yourself.
Successfully reach the Rescue Camp.
Defeat Lord Vanaduke in the heart of the Firestorm Citadel.
Alchemize a 5 star item.
Amass 10 guns in your Arsenal.
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.
Power up a derelict Mecha Knight.
Complete a Tier 3 expedition without having to revive.
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.