Here is the full list of all 43 Gunscape trophies - there are 28 bronze, 11 silver, 3 gold and 1 platinum.
Obtained all trophies in Gunscape!
Built a multi-map campaign
Published 20 maps
Programmed 5 Terminals
Won 25 Survival games
Won 25 Infection games
Killed 1,000 players with PFG
Killed 1,000 players with the E-Bow
Won 25 CTF games
Returned 25 flags
Stole 25 flags
Played first Team CTF game
Killed yourself 50 times
Killed 5,000 AI enemies
Played first Infection game
Killed 500 players with Dual Zhotguns
Killed 500 players with Gauss Rifle
1,000 player kills
Published first map
Created first map
Placed first Checkpoint
Placed 10,000 blocks
Placed first CTF Flag
Placed 100 blocks
Placed first block
Killed 50 players with Speargun tripwire
Played first Team DM game
Killed 100 players with the Flamethrower
Won 50 Deathmatch games
Killed 100 players with ID Disc
Punched 50 players to death
Backstabbed 5 players with a knife
Played first FFA DM game
Completed the Blowfish campaign
Played first Gun game
Killed first player
Rated first map down
Killed first T-Rex
Killed 100 AI enemies
Froze the ground and did a slide
Killed first Mech-man
Completed first Blowfish campaign map
Rated first map up