Here is the full list of all 19 Symphony of War: The Nephilim Saga achievements.
Complete the main story on Captain difficulty.
Complete the main story on Warlord difficulty.
Surrender all the Imperial Squads in Chapter 27.
Army size reaches 150 Units.
Have 9 Units in one Squad.
Unlock all Techs in a single playthrough.
Reach Max Faction Rank.
Use a Proof of Merit on a Unit.
Rescue all 4 children in Chapter 15.
Reach Faction Rank 9.
Class change to Tier 3.
Surrender 200 enemy Units in a single playthrough.
Form a Bond relationship.
Hire a Unique Mercenary.
Find or purchase an Artifact of Legendary rarity.
Class change to Tier 2.
Reach Faction Rank 4.
Defeat all enemies in Chapter 12.
Defeat Beatrix in Chapter 11.