Beat the game with five different characters. Whichever character you pick first will be the one that you'll unlock the corresponding character specific achievement for. Who you pick for your second and third characters doesn't matter (although I really ended up liking Goldar, his super does a lot of damage).
Arcade mode is fairly easy, not that many tips I can give. Spam your assists and just keep attacking to apply pressure and have the AI always playing defensively.
It has eight chapters. Most of the chapters are simple 3v3 matches but the later ones change things up a little like being 3v2 but the AI team of two will get twice the healt or a 3v1 where the one AI geta four times the health.
Chapter 5 can sometimes be a "special" match.
Chapter 6 is usually a Goldar 3v2.
Chapter 7 is usually a Ranger Hunter 3v2.
Finally Chapter 8 is always a Drakkon 3v1 (except when playing as Drakkon in first slot).
For that final fight it's likely you'll lose characters on your first few playthroughs fighting him, that's fine. Just play. Him the same way you would everyone else and make sure to use your Megazord special after your first character dies. I like the Dragonzord so I can spam
and hit him five times which should deplete over one health bar.
Game currenly has no cutscenes and you can't skip character intros. Press and hold
when you get to the credits to speed them up, right after you'll unlock your achievements.
Each run should take fifteen minutes or so a piece.
Check marks on the character select will keep track of who you completed the mode with.