Just play "Classic" to unlock "Ultimate Battler" Achievement. A Trainer was used to do 2-20 of "Battles" Rehash and resign. Code: 1. Classic – Defeat a series of randomly chosen heroes and villains set at your desired difficulty level. 2. Heroes Only – Can you stand against the might of the world’s most powerful heroes? X 3. Villains Only – Test your skills against the most dangerous villains the universe has ever know! X 4. Poisoned – Poison courses through your veins, constantly draining your health! X 5. Survivor – Your Heath Meter carries over from match to match! Perform feats of exceptional skill to obtain bonus health. X 6. Mirror Match – Fight as your opponent in a series of mirror matches! X 7. Mystery – Each match grants a mystery buff or debuff to your fighter! X 8. Fully Charged – Both you and your opponent have unlimited Super Meter but Super Moves are disabled! X 9. Combo Heaven – You must perform a combo of the required number of hits and win the match! Transitions and Super Moves are Disabled. X 10. Help From Above – Your opponents health will be restored to full every 30 seconds! X 11. Injured – Begin each match with only one quarter of your maximum health! X 12. Give And Take – You and your opponent gain health on each landed attack! You must defeat your opponent before time runs out! X 13. Sidekick – Two opponents per match on a single arena will push your abilities to the max! X 14. Speed Run – Can you defeat all of your opponents in under 2 minutes total? X 15. Random Fighter – Fight each opponent with a randomly chosen hero or villain! X 16. Countdown – You must defeat each of your opponents in under 30 seconds! X 17. Unstoppable – Defeat all of your opponents without losing a single match! X 18. The Max – You have one chance to defeat all of your opponents at maximum difficulty! X 19. Full House – Try to defeat the entire cast of Injustice! X 20. Impossible! – Attempt to defeat the entire cast of Injustice with a single Health Meter! X Download: Hidden Content: You must reply before you can see the hidden data contained here.