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