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