In Challenge mode, use Tyrone and have the enemy follow to the bottom right corner of the level. There is hut-like structure here. Go under it, then jump off to the cliff side. Dash back on top of the hut. When the enemy follows, freeze them in their Dash. They will fall to their death. You can easily get the Challenge mode achievements by doing this.
Shooting range
If you jump up and climb on top of the third row of targets you will be able to see a third row of targets. A bullseye on one of these is worth 5,000 points.
Shooting range
Successfully complete Mission mode.
Shooting Range Practice
Beat Mission Mode.
Unlock Billy Ray Logg
Beat him in mission mode with any character.
Unlock Challenge x15 (10)
Defeat 15 opponents in Challenge Mode.
Unlock Challenge x50 (20)
Defeat 50 opponents in Challenge Mode.
Unlock Combo Unlock x2 (15)
Kill 2 opponents in rapid succession.
Unlock Combo x5 (20)
Kill 5 opponents in rapid succession.
Unlock Complete Mission Mode (20)
Awarded for completing Mission Mode.
Unlock Completed Training (10)
Complete the Single Player training mode with any character.
Unlock ISO-7982
Complete mission mode.
Unlock Marksmanship (25)
Score over 10,000 in the 'Shooting Range'.
Unlock Mousey McNuts
Beat him in mission mode with any character.
Unlock Played 100 Matches (25)
Play 100 matches either offline or on Xbox LIVE.
Unlock Professor Von Brown
Beat him in mission mode with any character.
Unlock Six Degrees of Small Arms (0)
Play online to 'catch' this elusive Achievement.
Unlock Won 10 Matches (10)
Win 10 matches in Single Player or by playing on Xbox Live.
Unlock Won 100 Matches (25)
Win 100 matches in Mission Mode or Battle Mode.
Unlock Won 50 Matches (15)
Win 50 matches in Single Player or by playing on Xbox Live.