Killer Instinct

Fight Challenges can be found under Fight Archive. Fight Challenges are varied and feature many tiers. Each tier completed will net you 1 Fight Challenge. You will have to work through a total of 150 to unlock this achievement. Things begin to grind to a halt at around 135 Fight Challenges complete, so it's best to work on as many different ones as you can, rather than focus on just one category. The Fight Challenge categories for Tusk are as follows:

• Ranked Matches
• Counter Breakers
• Survival Matches
• Versus Matches
• Exhibition Matches
• Supreme Victories
• Aerial Attacks
• Skull Splitter
• Immortal Spirit
• Conqueror
• Autos
• Manuals
• Combo Hits
• Combo Breakers
• Combo Enders
• Throws