Ruthless Efficiency

Ruthless Efficiency is an achievement/trophy in Deus Ex: Mankind Divided. It is awarded for fully upgrading any upgradable weapon.

Tips

 * Because just about any weapon would do, the Stun Gun or Tranquilizer Rifle are prime candidates for the purpose of this achievement as both can be acquired right off the bat in Dubai if the non-lethal option is picked. For both, the player will only need to focus on ammo capacity upgrades, which wouldn't take all that many crafting parts to do, and getting a laser sight which is sold by several vendors in the area.
 * Other options for the task would be the Lancer variant of the Battle Rifle and the Devastator shotgun, as both will only accept three damage upgrades and nothing else. The Lancer can be found shortly after meeting Viktor Marchenko for the first time in Golem City, and sold by several vendors along with the Devastator after returning to Prague. A free Devastator can also be found in the security chief's office in London.