Check out this video tutorial on how to get many of the multiplayer achievements in Unreal Tournament III.
Here are the achievements and guidelines:
Get the "Head Hunter" award in 10 matches.
15 Headshots with the Sniper Rifle.
(You may want to activate "Slo Mo" instead.)
Don't taze me bro!
Get the "Combo King" award in 10 matches.
15 kills with the Shock Rifle's combo.
(Alt Fire, and then shoot the ball with main fire.)
Get the "Biohazard" award in 10 matches.
15 kills with Bio-Rifle.
(Same as in video,(it spawns for some reason anyways) but you have to pick up the Bio Rifle, since you can't select it from menu)
Get the "Gun Slinger" award in 10 matches.
15 kills with Enforcer.
Get the "Blue Streak" award in 10 matches.
15 kills with Stinger Minigun.
Get the "JackHammer" award in 10 matches.
15 kills with Impact Hammer.
(Hold RT and run into people)
Get the "Shaft Master" award in 10 matches.
15 kills with Link Gun's alt fire.
(Use LT, only works in close-mid range)
Big Game Hunter
Get the "Big Game Hunter" award in 10 matches.
15 kills with the Longbow AVRiL.
(Try doing VCTF games for this)
Have a nice day!
Got the "Rocket Scientist" and "Flak Master" awards in 10 matches.
15 kills with Rocket Launcher & 15 kills with Flak Cannon.
** While getting these achievements, you also work towards: **
- Sir Slays a Lot (20 games with Monster Kill)
-Off to a good start (First Blood x 40)
-Serial Killer (Killing Spree x 20)
- Paint the Town Red (Deathmatches x 100)
-Killjoy (kill someone on a spree x 20)
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