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