Persona 5 Royal
52 Achievements
1,000
100-120h
One Step at a Time
Completed a Mementos request.
15
27.26%
How to unlock the One Step at a Time achievement in Persona 5 Royal - Definitive Guide
Story-related and cannot be missed.
Requests, or 'Missions' in the Japanese version, are largely optional quests given throughout the game, which involve entering Mementos and finding a boss on one of the procedurally-generated floors. You will get these throughout the game, with most being automatically added to your requests list. Some are missable if you don't read a certain text message by Mishima, while others are tied to confidant ranks.
For some requests, you'll need to do some research, for example asking NPCs questions or eavesdropping on conversations to obtain information first. Generally this research doesn't spend in-game time.
The bosses generally aren't difficult and are closer to the mini-bosses in the Palaces, using an existing Persona as a template for the boss' moves and affinities. The requests are sorted into ranks, which corresponds to the boss' difficulty.
You will get this trophy on 5/7 with the request "Beware the Clingy Ex-boyfriend!". Unlike Persona 5, you do not need to do all Requests for the trophy. You only have to complete one request, and this request is mandatory for story progression. The trophy will unlock immediately after.
A full list of requests is available in this supplemental guide linked here: Persona 5 Royal: Guide Supplement.