Here is the full list of all 15 Lethal League Blaze achievements.
Beat the arcade mode with every character
Beat the story mode
Get a checkmark on every event in the story mode
Play 1000 matches
Hit a goal in Strikers with a ball of at least 250 speed
Reach a ball speed of one million
Play 500 matches
Rally the ball back and forth for at least ten times
Hit the ball back and forth in Lethal Volley for 16 times
Play 100 matches
Beat the arcade mode
Beat the arcade mode without using any continues
Bunt the ball at 1000 speed or above
Hit three players in a row
Reach a ball speed of one thousand