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