Power Rangers: Battle for the Grid

Very Simple.
Only choose Tommy in first place and complete the arcade mode

To unlock the achievement, start up Arcade and make sure your FIRST character is Tommy Oliver. For the other 2 characters I suggest picking 2 that you are really good with. I typically like to run with Jason Lee Scott (Red Ranger), Tommy Oliver (Green Ranger), Dragon Armor Trini (Left of Pink Ranger), or Lord Drakkon (Below Green Ranger). They are easy move spammers, but if you are unfamiliar with fighting games or are average, I made it through arcade by hitting , , and occasionally .

You don't have to beat every single enemy with Tommy specifically, but you do need to make it through 8 battles total (it will show 7 and then the last 1 is Drakkon and his team). Tommy can die, but as long as your team defeats the enemy team, you'll move forward to the next round.

If your whole team loses, you'll have to start over from the beginning. The enemies aren't too bad to fight, but occasionally you'll stumble across one that just spams moves to where you can't move. It's pretty obnoxious on the receiving end, but if they happen to take out your first character, recoup with the other two which is why I suggest picking characters you work well with.

After defeating Drakkon's team on round 8 and viewing the credits, the achievement will unlock!