|To unlock these achievements, you must connect 100 'Desperate Slashes' with your opponent.|
Although winning is sometimes referred to as 'Slash' in this game, what the achievement refers to is a 'Desperation Slash' (also known as a 'Fatal Slash' in the manual). You can only perform these Slashes when your health is below 30% and your health bar is pulsing red. The way to pull them off is slightly different for each character, being either , +, + or , +, + .
Recommended: Set up a five-round, infinite timer game in Versus with Claude as Player 1 and anyone as Player 2. Have both players reduced to critical health (pulsing red health bar) and then have Player 1 (Claude) input , +, + . If performed right, the screen will darken and the words 'Desperation Slash' will appear on the screen after the attack. Alternate who dies each round for maximum efficiency.
NOTE: The Slashes only need to connect with the opponent, not kill them (although that is nice too).