Here is the full list of all 81 Guncraft achievements.
Capture the flag 100 times
Capture the flag 35 times
Capture the flag 10 times
Build 10,000 blocks
Get 5 kills without dying
Collect $10,000
Destroy 100,000 blocks
Destroy 1 million blocks
Destroy 10 million blocks
Build 100,000 blocks
Build 500,000 blocks
Get 10 kills without dying
Get 20 kills without dying
Win a match using a class with no bonuses or killstreaks
Kill 25 enemy players
Kill 100 enemy players
Kill 1,000 enemy players
Kill 10,000 enemy players
Collect $100,000
Collect $1,000,000
Collect $5,000,000
Run 200,000 block lengths
Run 400,000 block lengths
Freeze 25 enemy players
Freeze 100 enemy players
Freeze 1,000 enemy players
Hit somebody with the Bunker Buster itself
100 Players used your armor pack
Kill an enemy using a Jetpack with a Javelin missile
Get 10 kills between you and your gunner in a single tank
Destroy an AC-1337 within 10 seconds of it spawning
Kill 100 enemies with your AI SAM Site or Turret
Using only your Jetpack and Parachute, stay airborne for 1 minute
Kill 6 enemies before Predator Mode expires
Your team killed 15 enemies before Radar Jammer expired
Use the ammo pack from Pandora's Box to refill your ammo
Kill 100 enemies using vehicles
Kill 1,000 enemies using vehicles
Capture the flag with the Megablox suit
After being frozen, barely escape the clutches of the rising lava
Destroy an enemy's Helicopter and watch their snowy body fall into the lava
Freeze 5 people without dying
Win a round of Lava or Meteor Survival without being frozen
Win a round of Meteor Survival without being the last person standing
Win a round of Meteor Survival only because you were the last man standing
Gain 20 points as a wisp in one round of meteor survival
Survive taking fire damage while frozen in meteor survival
Capture a flag without transferring or dropping it
Defend your flag while it's dangerously close to the enemy capture point
Mine over $5,000 for your team in one Siege Mode game
Mine over $10,000 for your team in one Siege Mode game
Destroy 100 enemy trebuchet blocks
Destroy 1,000 enemy trebuchet blocks
Help construct 10 trebuchet segments
Help construct 50 trebuchet segments
Spend $5,000 on prefabs to defend your base in Siege Mode
Spend $50,000 on prefabs to defend your base in Siege Mode
Score the most points in a round of Onslaught
Raise your respawn timer in Onslaught to over a minute
Reach wave 25 in Onslaught
Reach wave 50 in Onslaught
Win a 16 player race without using any powerups
Win a race with a friend or clan member sharing your bike
Win a 3 round match of spleef without anyone else scoring any points
You shared and played custom maps with 100 people
You got your first gun or skin approved
Vote on 10 guns or skins
Vote on 100 guns or skins
Vote on 1,000 guns or skins
Win a 16 player Paranoia game as the only Human left alive
Use your Blood Test perk to uncover both Queens at once
Use your Blood Test perk to unsuccessfully mark at least 5 Human players
Kill 100 Zombies
Kill 100 Lunatics
Kill 30 Queens
Kill both Queens in a 16 player Paranoia game without any Humans being converted
Cure 50 Humans of ailments inflicted by the Queen
As a Queen, use one of your perks against at least 5 Humans at once
Convert 100 Humans
Kill 3 Human players within 15 seconds of being uncovered as a Queen
Convert 7 Humans in one round of Paranoia as a Zombie or Lunatic