Here is the full list of all 12 Sanctum 2 trophies - there are 7 bronze, 4 silver and 1 gold.
Complete one level with 5 Feats of Strength enabled in Co-op.
Reach Rank 10.
Complete a map with 5 Feats of Strength enabled.
Complete a map with a Feat of Strength enabled.
Upgrade a tower to the max.
Build 20 tower bases.
Complete your first map.
Complete Facility, Rocky Fields, Giant Trees and Swamp.
Reach rank 20.
Complete Facility, Rocky Fields, Giant Trees and Swamp with 5 Feats of Strength enabled.
Complete The End in a party of four.
Complete a game in a game.