Top Ten Hardest Medals to Earn in Halo: Reach

The title kind of speaks for itself...these are the most difficult medals to get in the game, specifically in matchmaking.
The Top Ten
1 Unfrigginbelievable (Halo: Reach Medal)

Kill 40 multiplayer or 1000 campaign/firefight opponents in a row without dying.

2 Killionaire (Halo: Reach Medal)

Kill 10 opponents in the blink of an eye.

3 Thriller (Halo: Reach Medal)

There are very few humans in infection to start and the more you kill the more likely it is the zombies will kill too many for you to get the achievement. Also, you can't die, which is really easy in infection.

Kill 15 humans as a zombie without dying.

4 Corrected (Halo: Reach Medal)

Kill 15 opponents with grenade sticks without dying.

5 Perfection (Halo: Reach Medal)

Win a slayer game without dying with at least 15 kills.

6 Skullamanjaro (Halo: Reach Medal)

Score 10 skulls at once in Headhunter.

7 Be the Bullet (Halo: Reach Medal)

Kill 15 opponents with a sniper weapon without dying.

8 Hero (Halo: Reach Medal)

Complete a wave as the last man standing.

9 Sunburst (Halo: Reach Medal)

Kill 15 opponents with a Spartan Laser without dying.

10 Sunday Driver (Halo: Reach Medal)

Splatter 15 opponents using a vehicle without dying.

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