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