Here is the full list of all 26 Mare Nostrum achievements.
Win every official map as an Axis soldier.
Win every official map as an Allied soldier.
Destroy 20 tanks using the Boys anti-tank rifle.
Destroy 10 tanks using a captured Boys anti-tank rifle.
Win a match as every nationality.
Play 25 matches.
Kill 100 axis troops in a Vickers Light Tank.
Destroy 10 vickers tanks with an LG40.
Destroy 15 Bofors Anti-Aircraft guns.
Kill 10 Valentine tanks with a Geballte Ladung.
Win 10 matches as either British or Australian forces.
Win 5 matches as Polish forces.
Win 5 matches as Italian forces.
Capture 75 objectives as an Allied soldier.
Capture 75 objectives as an Italian soldier.
Destroy 100 enemy vehicles with Allied armour.
Destroy 100 enemy vehicles with German armour.
Destroy 100 enemy vehicles with Italian armour.