While playing as Colt, kill Frank. Or Charlie. Or Fia. Or Wenjie. Or Aleksis. Or Harriet. Egor will do as well.

Kill 3 enemies with the machete in 10 seconds.

Upgrade the Adrestia to Legendary Status.

Unveil all sub-regions of Greece.

Complete all underwater location objectives.

Deliver your first piece of lost cargo.

Max-rank each standard Keepsake

Complete 20 Quests on Pephka, Obsidian and Abantis islands.

Complete Xenia's questline.

Complete the Hippokrates questline.

Earn all Chthonic Companions

Fulfill the 'War-God's Bloodlust' Prophecy