The Unfrigginbelievable medal is awarded to individuals after killing 40 opponents in a row without dying on multiplayer matchmaking and Halo 4 Spartan Ops, or after killing 1000 opponents in a row without dying on firefight or campaign in Halo: Reach.
The Unfrigginbelievable medal is the final of the spree medals, and one of the legendary medals in Halo: Reach and Halo 4. This medal can be awarded on any gametype, so long as the kill limit is above 40, and is assumed to have a Bungie rating of 10/10 - meaning this medal is the most difficult spree medal to achieve.
- This medal takes on the appearance of the Halo 3 Invincible medal.
- It has been proven that the highest spree possible is 255 kills. Even if you get more kills after that number, without dying, it will still say that your highest spree was 255 kills. This is most likely because 255 is the maximum value representable by an eight-digit binary number, and therefore the maximum representable by an unsigned 8-bit byte.