Halo 5: Guardians - I Thought I'd Lost You

Escape from Hunters in the lab and find them in the hangar in Blue Team - 10

Mission 2 - Blue Team

Difficulty - Any (Easy)

When you first come in contact with the Hunters, quickly loop round the edge of the room to the Nuclear Pod which you can interact with to move it and jump down into the vents. Don't shoot the Hunters, don't melee them - just quickly ignore them and loop around the edge of the room. Later on when you come the hangar, where your second pair of Hunters will spawn. Kill them, then the original pair of Hunters will enter the room afterwards. As soon as they enter the room the achievement will pop.

Pair of Covenant Hunters