A guide on how to easily unlock all the “beat in 25 rounds” achievements. This is an exploit, no cheats or mods required.
Easy 25-turns Achievements
It is recommended that you have at least adequately upgraded your skills and bought the apropriate items for the best experience. Make sure you can make quick work of the starting enemies.
Getting the Achievements
Select the girl you want to get the achievement for.
While you have her portrait pulled up, enter challenge mode.
In challenge mode, enter and exit until you get an easy opponent. It doesn’t matter that you are not fighting the right girl, so long as you entered challenge mode with her portrait open.
Beat the opponent in less than 25 turns. After defeating them, quit. You should get the achievement you wanted.