Here is the full list of all 30 Seraph achievements.
Upgrade a Blessing to rank 5.
Transmute a MK4 weapon.
Kill the Herald at difficulty 6.0 and above.
Kill 8,888 Daemons.
Defeat the final threat to Seraph.
Seraph is reborn.
Collect 75 story logs.
Collect 50 story logs.
Obtain a Supreme Shard.
Transmute the MKII version of each weapon.
Collect 25 story logs.
Score among the top 75% on a Daily challenge.
Reach 6 pips on the difficulty meter.
Kill 50 enemies under the influence of the Double Damage Orb
Kill 888 Daemons.
Kill an 'enhanced' Elite (Bloody, Tainted, Dark).
Kill the Herald.
Equip a Miracle other than Orb or Repel.
Post a score in Survival mode
Unlock a weapon, Ward or Miracle through Transmutation
Attach a Shard to an Oath.
Unlock Daemonsight through Transmutation
Destroy a Fountain of Terminus.
Kill 88 Daemons.
Slay a Lieutenant of Terminus.
Score among the top 25% on a Daily challenge.
Reach difficulty 8.0 in Survival or New Game.
Reach difficulty 9.0 in Survival or New Game.
Score among the top 10% on a Daily challenge.
Defeat the final threat to Seraph at difficulty 8.0 and above.