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