Here is the full list of all 46 Gladio achievements.
Defeat 1,000 Enemies.
Defeat 5,000 Enemies.
Defeat 10,000 Enemies.
Defeat 25,000 Enemies.
Defeat 50,000 Enemies.
Defeat 100 Archers.
Defeat 1,000 Archers.
Defeat 2,500 Archers.
Defeat 5,000 Archers.
Defeat 10,000 Archers.
Defeat 100 Grunts.
Defeat 1,000 Grunts.
Defeat 2,500 Grunts.
Defeat 5,000 Grunts.
Defeat 10,000 Grunts.
Defeat 100 Legionaries.
Defeat 1,000 Legionaries.
Defeat 2,500 Legionaries.
Defeat 5,000 Legionaries.
Defeat 10,000 Legionaries.
Defeat 100 Knights.
Defeat 1,000 Knights.
Defeat 2,500 Knights.
Defeat 5,000 Knights.
Defeat 10,000 Knights.
Defeat 100 Mages.
Defeat 1,000 Mages.
Defeat 2,500 Mages.
Defeat 5,000 Mages.
Defeat 10,000 Mages.
Impale 10 Enemies.
Impale 100 Enemies.
Impale 500 Enemies.
Impale 1,000 Enemies.
Defeat 10 Enemies while Buffed.
Defeat 100 Enemies while Buffed.
Defeat 500 Enemies while Buffed.
Defeat 1,000 Enemies while Buffed.
Defeat 3 Enemies with a single Buffed Attack.
Defeat 6 Enemies with a single Buffed Attack.
Defeat 10 Enemies with Lasers.
Defeat 100 Enemies with Lasers.
Defeat 500 Enemies with Lasers.
Defeat 1,000 Enemies with Lasers.
Defeat 5 Enemies with a single Laser.
Defeat 10 Enemies with a single Laser.