Final Fantasy VII Remake - Mini-games Guide

There are couple of mini games that you can play in FF7 Remake.

Darts

After doing side quests in CH03 and you return to the Seventh Heaven, Cloud will be left to spend some time alone in the bar. You will not have to play the darts. You need to raise at the top of the board, which is under 8 tries to reach the goal. 

Whack-a-Box

During Chapter 8, you will unlock some side quests. You will unlock them  as soon as you finish the main story with Aeris when you need to bring back the lost children.

Complete "Kids on Patrol" quest to unlock "A Verified Hero" quest. Now you can play Whack-a-box by speaking to Sarah in the Children's Secret Hideout. Pass the 10,000 points to finish the quest. Aim for 30k for a trophy.

During Chapter 14, after you unlock side quests, you can go back to Children's Secret Hideout. Sarah will this time offer you to play Hard mode of Whack-a-Box challenge. Simply obtain 30,000 points for the trophy.

Squats

In Chapter 9, when you beat the colosseum and leave Aerith, you will go back and speak with Sam. Side quests will now open. Simply go the the gymn and first beat the opponent that has a quest marker (Burning Tighs Quest). You will have to defeat 3 opponents for the trophy; first being the quest itself, second is Jay (blonde guy) and Pro level guy is Jules. Good luck!

Pull-Ups

First, follow the main story in Chapter 14 until you unlock side quests.

You need to speak with Andrea in the gymn (before that, you can speak with the guy in front of the Honeybee Inn to learn about his werabouts). This will also be part of Wavering Heart quest. After beating Andrea, you still need to beat two other opponents.