DEUS EX: HUMAN REVOLUTION

For this Achievement you need to fully Upgrade one of your Weapons. That means Attachments (like Laser, Silencer) and Weapon Upgrades (Reload Speed etc) There are two Weapons that are easy to upgrade.

The first Weapon the Huntsman Silverback (double-barrel Shotgun - PreOrder/DLC Item) need only three Upgrades.

1x Damage Upgrade
2x Reload Speed Upgrade

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The 2nd is the PAX-22 (Tranquilizer rifle), that use only four Upgrades.

1x Target-Leading System
3x Reload Speed Upgrade

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The best Way to obtain this achievement for the PAX-22 is, when your the first time in Hensha (see Video!). Collect the Reload-Speed Upgrade and the Target-Leading System in near the Hive then head to Tai Yong Medical. There you get a Reload Speed Upgrade and the PAX-22. If you have the PAX-22 combine all Upgrades. The last Reload Speed Upgrade can be found in Montreal in Office on the 1st Floor (Restricted Area)

other Target-Leading System Locations:
- Can be bought from Gang leader near helipad in Highland Park.
- One in a low-level locked garage west of The Hive.
- Grayson at the Gas Station after your return to Detroit.
- Seurat after your return to Detroit.
- Lin Fu Ren in Hung Hua Hotel, during second visit to Hengsha.
Belltower dock, You can find one in an open metal cargo pod located on top of a bunc of stacked metal cargo pods. May need enhanced jump to reach.


other Reload Speed Upgrade Locations:
- Inside the locker room near the Morgue in Detroit Police Station.
- On the highest level of the fire escape in the entrance area to Derelict Row. Can be obtained by object stacking, reaching for it after jumping or using the jump enhancement augmentation.
- FEMA camp, Level -4, in the security office near the elevator to -5.
- One locked behind a level 2 secured garage left of the Hung Hua Hotel's first floor.
- Where you find the eBook Better Than Nature in Tai Yong Medical.
- Inside a locker within a locked office of the Picus Sub-Basement.
- Can be bought from Grayson during your second visit to Detroit.
- Purchasable from Lu Pin Rong in the sewers beneath Belltower dock.
- Belltower dock, upper area of warehouse interior on a shelf.
- In Singapore, inside the soldier barracks, behind a locked room. This is located in the same building as the jamming relay control panel. The code is 1385.


Damage Upgrade Locations:
- At the Milwaukee Junction plant in Lab 2, in Storage room 3, inside a crate that a Purity First member is searching.
- from Grayson at the Gas Station during both visits.
- Lin Fu Ren in Hung Hua Hotel.
- Harvester Hideout, bottom level, in one of the cells with a breakable wall.
- Belltower dock, locked room on the left sublevel of the outside area, rooms are guarded by a ceiling mounted turret.
- Omega Ranch, in the room where you disable the jammer, behind a level 5 security door

thx to deusex.wikia.com for the Upgrade Locations

Throughout the course of Deus Ex: Human Revolution you will acquire many upgrades for the guns that you carry. These consist of Damage, Reload Speed, Ammo Capacity and Rate of Fire. Some guns will also have bonus upgrades such as Heat Seeking and Laser Targeting. The easiest gun by far to upgrade is the Tranquilizer Rifle. The upgrades consist of 3 Reload Speeds and 1 Target-Leading System. All of the other guns require inputs of damage, reload, ammo and rate of fire and then the bonus upgrades as well. The easiest way to obtain the Tranq Rifle is at the beginning of the game, the mission where you first come back to work with augmentations, when David Sarif asks you if you prefer lethal or non-lethal, choose non-lethal, and when asked if you prefer to be up close or far away, choose far away. If you are already in game and chose a different path I believe the earliest you can get the tranq rifle is from Seurat in Detroit. Happy Hunting!!


Edit: For those who have the pre-order bonus of the double barrel shotgun it requires 1 Damage and 2 Reload Speed. Information comes from Undervip.

Edit : If this helps as well, I finally got this achievement on the Lower Tai Yong Medical level from upgrading the Tranq rifle.

The specific location for the last "Reload Speed" kit that I found is right near the XP ebook "Better than Nature".

This is assuming you searched around or bought the other upgrade kits required (2 other "Reload Speed" kits and "Target" kit).

Note: You can also just collect and store the 2 "Reload Speed" kits and "Target" kit until the reach the location I mentioned above (where the XP ebook "Better than Nature? is) since that area also includes a Tranq rifle for free almost like the game developers created it that way!

Thanks to MxRugg for this information!