Here is the full list of all 19 Shoot Many Robots: Arena Kings achievements.
Complete a game while Arena Kings is in beta
Complete the All-American's first challenge
Complete the All-American's second challenge
Complete the All-American's third challenge
Complete the No Bull's first challenge
Complete the No Bull's second challenge
Complete the No Bull's third challenge
Complete Lou's first challenge
Complete Lou's second challenge
Complete Lou's third challenge
Complete Lulu's first challenge
Complete Lulu's second challenge
Complete Lulu's third challenge
Complete the Woodpecker's first challenge
Complete the Woodpecker's second challenge
Complete the Woodpecker's third challenge
Complete the Decima's first challenge
Complete the Decima's second challenge
Complete the Decima's third challenge