In Combat Time, you'll build up your bond gauge (found in the middle) through successful hits on the enemy. Once you've built it up all the way, you'll be given two different options: using the Jake forms, or by using your sword's special ability. For this achievement, you must press all of the form buttons at least once during your playthrough of the game. You are given at least four fights during your first case, so if you truly want to, you could easily finish this within the first Act. Each button of the directional pad (
) needs to be used at least once during the fight and include:
Like in the cartoon, Finn will jump inside and take control of Jake's body. This has a powerful attack to it, but it can't properly home in on enemies like Finn normally can.
Jake will stretch his body to create spikes, allowing you to simply walk into enemies to hurt them.
Jake will spin around, allowing you to simply run into the enemies to cause damage.
Jumping some distance away from the enemies, Jake will allow you to catapult bombs onto the enemies in groups.