Full list of all 21 GUNS UP! trophies - 13 bronze, 7 silver and 1 gold. It takes around 20-25 hours to unlock all of the trophies in the base game.
The base game contains 12 trophies, and there are 4 DLC packs containing 9 trophies.
Attack 3 friends
Collect 3 Daily Rations
Obtain a Legendary card from PVP Rewards or Card Pack
Earn 4 or more Veterans in a single battle
Spawn 5 different Veteran unit types in one battle
Play one more than your daily Alliance Battle limit
Earn 300 Alliance Points in a Season
Be in an Alliance that receives a badge at the end of an Alliance Battle Season
Obtain a Level 7 Wall