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