As the title suggests, I think it would be a big improvement to quality of life if you could select 1-3 achievements to be actively tracked in-game.
Especially ones such as the Sniper Elite achievement, which requires 20 headshots in one game. It would be nice to see where you stand, and if you completed it. This would let the player be able to ensure it was completed and return to normal gameplay.
Currently, the 3 daily missions are shown on the right side of the map. The 1-3 selected achievements could be shown the left side of the map.