Crisis Core: Final Fantasy 7 Reunion, like most entries in the Final Fantasy series, is chock-full of riveting side quests that offer brief glimpses into the game's lore. Each quest allows Zack to take small detours away from the main story, but not all of them can be completed during the first playthrough.
Most of the trophies in Crisis Core: Final Fantasy 7 Reunion are tied to quests that can only be accessed during certain parts of the game. If the player misses any of these trophies, they will need to return to the moment just before they were missed, or else miss out on them entirely. Though these trophies can be obtained in New Game Plus, it's handier to get them all during one playthrough.
Hero of the Wutai War?
The player can easily miss the Hero of the Wutai War? Trophy if they fail to vanquish the Wutai forces in Chapter 1. Finding them all requires the player to thoroughly investigate each area before exiting through the door at the end of the stronghold. To obtain the trophy, Zack must vanquish twenty different enemy groups, two of which can only be found by interacting with the towers at the front of the base.
Master Mako Stone Miner
The Master Mako Stone Miner trophy can be unlocked shortly into the beginning of Crisis Core: Final Fantasy 7 Reunion by completing the M8-2: Mako Stones missions. To gain access to them, Zack must speak with the Researcher standing in the Materia Room in the Shinra Building.
Slicin' SOLDIER
The Slicin' SOLDIER trophy can be obtained by successfully destroying all the incoming shells in Chapter 2. While it can be quite difficult to figure out when to swing Zack's sword, the visual and audio cues should make the process somewhat easier.
Banora Treasures
Immediately after obtaining the Slicin' SOLDIER trophy in Chapter 2, Zack must sprint back to Angeal's house before the time runs out. Before heading straight to his destination; however, he should collect the five glowing objects scattered throughout the area. Doing so will reward him with some helpful items, while also unlocking the Banora Treasures trophy.
Fan Club Aficionado
In Chapter 2, Zack gets access to Sector 8. Sadly, it's possible to progress forward without ever visiting the area, as the game fails to inform the player that Zack can go there.
To obtain the Fan Club Aficionado trophy, Zack must approach the three women standing together in the Sector 8 - Fountain. There, he will learn about the various SOLDIER fan clubs spread throughout Midgar, before receiving the opportunity to join two of them. He can also approach the lone woman on LOVELESS Avenue to become a member of the Loveless fan club.
In Chapter 5, Zack can join the Silver Elite by conversing with the boy in the Sector 6 Slums - Park. The child will ask Zack a series of Sephiroth-related questions to test his knowledge. To gain access to the club, the player must answer the first question with "Masamune," the second with "Super Nova," and the third with "His left hand." In Chapter 6, Zack can join his own fan club by speaking to the left receptionist in the Shinra Building.
First-Rate SOLDIER
The First Rate SOLDIER trophy can be obtained during Chapter 3 by interacting with Hojo in the Training Room. Hojo will then ask Zack to battle a series of experiments that must all be vanquished in order for the trophy to be earned.
Everyone's Hero
The Everyone's Hero trophy can only be acquired by rescuing the endangered civilians spread throughout Midgar during Chapter 3. To find them all, Zack must explore each area carefully and defeat the enemies that threaten them. Once the three citizens on the SOLDIER Floor of the Shinra Building have been saved, the remaining two can be found cowering on LOVELESS Avenue.
Precise Restoration
In Chapter 4, Zack is tasked with protecting Hojo from the attack on the Shinra Building. Before interacting with him; however, Zack can examine the equipment at the far side of the room and use it to configure the Mako Recovery Unit. To obtain the Precise Restoration trophy, players must activate the device, wait five seconds, then deactivate it.
Of Significant Worth
To obtain the Of Significant Worth trophy, Zack must approach the pod in Hojo's lab and answer Hojo's questions correctly. The answer to the first question is "A SOLDIER operative like Sephiroth," the second is "State-of-the-art science and technology," and the third is "A person unafraid to challenge Shinra."
Cell Raider
During the attack on the Shinra Building, Zack will be given the option to explore the 67th Floor. If Zack defeats all the enemies wandering the hallways, he will obtain the six keys required to open the cells on the same floor. Once each cell has been looted, the Cell Raider trophy will be rewarded.