Here is the full list of all 30 Seraph achievements.
Kill the Herald.
Score among the top 75% on a Daily challenge.
Score among the top 25% on a Daily challenge.
Kill 50 enemies under the influence of the Double Damage Orb
Post a score in Survival mode
Kill 888 Daemons.
Equip a Miracle other than Orb or Repel.
Reach difficulty 9.0 in Survival or New Game.
Reach difficulty 8.0 in Survival or New Game.
Kill an 'enhanced' Elite (Bloody, Tainted, Dark).
Unlock a weapon, Ward or Miracle through Transmutation
Reach 6 pips on the difficulty meter.
Destroy a Fountain of Terminus.
Unlock Daemonsight through Transmutation
Kill 88 Daemons.
Attach a Shard to an Oath.
Slay a Lieutenant of Terminus.
Collect 25 story logs.
Transmute the MKII version of each weapon.
Defeat the final threat to Seraph.
Kill the Herald at difficulty 6.0 and above.
Collect 50 story logs.
Collect 75 story logs.
Transmute a MK4 weapon.
Upgrade a Blessing to rank 5.
Kill 8,888 Daemons.
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.
Seraph is reborn.