Lollipop Chainsaw

This trophy is story-related and cannot be missed. You will earn this trophy shortly after defeating the boss at the end of Stage 5.

Phase 1

He will start by riding around in circles with his flaming bike, which he seems to have borrowed from Ghost Rider. Attack him when he is up close, using chainsaw attacks while dodging. You can ignore other stationary zombies, as they don't try to attack you. Simply wait for him to drive towards you, with his guitar in hand, ready to strike it down and counter his attack. If you damaged him enough, he will enter a dazed state. Get near him and finish him off.

Phase 2 and 3

He will merge with his bike and turn into metallic elephant/bike thing. He attacks by jumping, with his right arm, which has a saw attached and has long reach, his gatling gun or a charged lunge attack. You can see when this will happen when he combines both his hands in front of him with the saw. You might notice stone pillars around you. When he performs his lunge attack, he may get stuck in one of the pillars and be vulnerable to attacks. Also he will stop for a moment to let off steam after each attack.

After you finish him off once more, he will gain about 10% of his health back and continue with same attacks. Finish him off again to enter next phase.

Phase 4, 5 and 6

During these phases, he will have much more mobility and his speed will increase as well. Most of his attacks during first half will be spinning attacks, that are easy to avoid. He will once again enter dazed state after each attack, but be careful not to attack him to many times as he recovers quicker and counters by spinning. Just keep attacking and dodging until you finish off another phase.

He will once again recover about 20% of his health back and continue attacking you. His attacks will be a little different this time though. In addition of his spinning attack, he will also bash his remaining arm to the ground couple of times to attack you. All of which are easily dodgable.

After he loses his other arm, he will use consecutive ramming attacks. He is much more easy to defeat now, as he only recovers 10% of his health. Simply deplete his health and finish him off for...

Phase 7

...yet another phase. Persistent, this one. This phase will be a little harder compared to previous ones. He will use bombs, mines and rockets to attack you. Also will have some damaging evasion moves, so don't continuously attack him and try not to stay too close to him. He will also have some charged ramming attacks, which can be dodged by circling around him. Continue attacking with everything you have and finish him off for good. Credit to omegaevolution:

https://www.youtube.com/watch?v=DM3vBDq1C5E