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.
Unlock all Techs in a single playthrough.
Reach Max Faction Rank.
Surrender 200 enemy Units in a single playthrough.
Form a Bond relationship.
Defeat all enemies in Chapter 12.
Have 9 Units in one Squad.
Rescue all 4 children in Chapter 15.
Reach Faction Rank 9.
Defeat Beatrix in Chapter 11.
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.
Class change to Tier 2.
Reach Faction Rank 4.