Double Kill - scoring 2 kills within 3 seconds
Triple Kill - scoring thrid kill within 3 seconds after Double Kill
Quad Kill - scoring a fourth kill within 3 seconds after Triple Kill
Penta Kill - scoring a fifth kill within 3 seconds after the Quad Kill
Sexta Kill
Septa Kill
Octa Kill
Nona Kill
Deca Kill

Two in One - killing 2 players with one shot
Three in One - killing 3 players with one shot
Four in One - killing 4 players with one shot
Are you Kidding Me - 4 or more in one

Headshot - railgun only?

Head Hunter - 3 headshots in a row

Bull's Eye - ?

Rage Quit - a user left right after you killed them

Kernel Panic - ?

Payback - killing someone who just killed you
First Blood - being the first one to kill someone in the game
You Suck - suicuide ?

Owned - for killing the same user 3rd time in a row
Merciless - for killing the same user 5 times in a row 
Make it Stop - for killing the same user 10 times in a row

Awesome - scoring a kill with a direct hit using a projectile weapon on an airborne target
Nice - scoring a hit with a railgun on an airborne target 
Sweet - scoring 2 hits with railgun in succesion
Sublime - scoring 5 succesive hits with the railgun
Aimbot - scoring 10 succesive hits with the railgun

5 Minutes Left
3 Minutes Left
1 Minute Left
15 Seconds Left

10
9
8
7
6
5
4
3
2
1

Over Time - game is extended due to a draw situation
Victory - winning a match
Defeat - loosing a match
Merciless Victory - winning with no loss what so ever
Embarrasing Defeat - loosing with no score

Glory
Shame

Get Ready - the game starts soon
Go - the game is on