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