Here is the full list of all 41 Siege Survival: Gloria Victis achievements.
Unlock Demetrius as a playable character.
Unlock all available playable characters.
Finish the scenario without loosing any survivor.
Complete the main storyline in one of the following scenarios: Story, Quick start, or Explorer.
Keep the defence so firm, the relief forces completely smash the enemy.
Provide the soldiers with enough food that they get a boost
Galvik survives and returns to the Bastion.
Craft a sword using the upgraded Armoury.
Craft a heavy armour using the upgraded Armoury.
Use the trebuchet during a battle.
Reach 50 points of the the Bastion strength.
Unlock all the scavenge starting point during a single scenario.
Manage a party of 4 characters at once.
Unlock Jacob as a playable character.
Prepare for using the trebuchet by scoring 4 points in scouting before a battle.
Join any new character to your group.
Unlock Mikel as a playable character.
Kill an enemy guard at night.
Send out at least 2 characters to scout the enemy lines at night.
During an enemy assault exceed their strength so much, they will flee from the battlefield.
Defender unlocked scenario is now available for you to play
Scavenger unlocked scenario is now available for you to play
Survive the first 7 days of the invasion.
Complete trade with any merchant at night.
Survive a fight during the nighttime scavenge.
Build enough beds for all characters.
Collect all piles inside the castle.
Quick Start scenario is now available for you to play
Explorer scenario is now available for you to play
Unlock Rena as a playable character.
Complete the Scavenger scenario.
Complete the Defender scenario.
Complete the Survivalist scenario.
Win all battles of the whole scenario.
Kill 3 enemy guards during a single night.
Unlock Gerard as a playable character.
Unlock Kimbra as a playable character.
Unlock Rose as a playable character.
Reach 75 points of the the Bastion strength.
Find and collect all the treasure chests available in the whole scenario.
Survivalist unlocked scenario is now available for you to play