Full list of all 20 Retro Tanks achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
Beat the first 10 levels in any mode
Beat the first 20 levels in any mode
Beat the first 30 levels in any mode
Beat the first 40 levels in any mode
Beat the Normal Mode
Beat the Hard Mode
Beat the Bomb Mode
Beat the Invisible Mode
Beat the Speed Mode
Beat the Perspective Mode
Beat Stage 1
Beat Stage 2
Beat Stage 3
Beat Stage 4
Beat Stage 5
Beat Stage 6
Beat Stage 7
Beat Stage 8
Beat Stage 9
Beat Stage 10