Full list of all 44 Gunscape achievements worth 1,000 gamerscore. It takes around 12-15 hours to unlock all of the achievements on Xbox One.
Publish 20 maps
Kill 5 players with a knife
Place your first block in Build mode
Kill 50 players with Fists
Create your first map
Kill 100 players with the Flamethrower
Build a multi-map campaign
Place 100 blocks in Build mode
Win 50 Deathmatch games
Place a Checkpoint in your map
Invite a friend to play Gunscape with you
Play your first Infection game
Kill a dinosaur boss
Program 5 Terminals
Kill 100 AI enemies
Kill an enemy player
Play your first Team Capture-The-Flag game
Steal 25 flags in CTF
Win 25 CTF games
Kill 5,000 AI enemies
Rate another player's map as bad
Win 25 Infection games
Play your first Team DeathMatch game
Publish your first map
Play your first Free-For-All DeathMatch game
Play your first Gun Game game
Kill 1,000 players with E-Bow
Kill 1,000 players with PFG
Return 25 flags in CTF
Finish the first Blowfish campaign map
Play your first split-screen game
Kill 1,000 players
Kill 100 players with ID Disc
Use the Freezethrower to slide 3 blocks
Kill 500 players with Gauss Rifle
Kill 500 players with Dual Zhotguns
Place 10,000 blocks in Build mode
Kill yourself 50 times
Win 25 Survival games
Place a Flag in your map
Kill a robot boss
Kill 50 players with Speargun
Finish the Blowfish campaign
Rate another player's map as good