Here is the full list of all 31 Seraph trophies - there are 14 bronze, 10 silver, 6 gold and 1 platinum.
Kill 888 Daemons.
Score among the top 75% on a Daily challenge.
Unlock a weapon, Ward or Miracle through Transmutation
Unlock Daemonsight through Transmutation
Attach a Shard to an Oath.
Destroy a Fountain of Terminus.
Reach 6 pips on the difficulty meter.
Kill 88 Daemons.
Slay a Lieutenant of Terminus.
Collect all other Trophies.
Kill an 'enhanced' Elite (Bloody, Tainted, Dark).
Kill the Herald.
Collect 25 story logs.
Equip a Miracle other than Orb or Repel.
Post a score in Survival mode
Kill 50 enemies under the influence of the Double damage Orb
Transmute the MKII version of each weapon.
Defeat the final threat to Seraph.
Kill the Herald at difficulty 6.0 and above.
Score among the top 25% on a Daily challenge.
Collect 50 story logs.
Collect 75 story logs.
Transmute a MK4 weapon.
Upgrade a Blessing to rank 5.
Reach difficulty 8.0 in Survival or New Game.
Seraph is reborn.
Kill 8,888 Daemons.
Reach difficulty 9.0 in Survival or New Game.
Score among the top 10% on a Daily challenge.
Obtain a Supreme Shard.
Defeat the final threat to Seraph at difficulty 8.0 and above.