Quest

A quest is any special mission You can choose to accept; a journey towards a specific goal. Generally a quest is of major importance compared to the sorts of requests any slut would ask of You if they could. Often at least an entire world at stake. (Though it may appear quests are time-sensitive, this is never actually the case. Like in a typical game, choosing to indefinitely postpone or ignore a quest has no actual consequences!)
While circumstances vary by timeline, generally Your quests include at least the Main Quest and Meta Quest both of which are ongoing throughout Your entire playthrough. Other likely quests are summarized below.

Meta Quest. Maximize Your own pleasure, arousal, and happiness. Fucknuke and impregnate absolutely everyone and everything.
Main Quest. Earn the Deed of Defeat for every penultimate that could ever exist.
Arsenal Quest. Attain a full and optimized loadout of slut-equips to include multiple melee weapons, ranged weapons, and rides. Perform at least one Transformation Sequence with all of them.
Marriage Quest. Marry at least 8 Ωmniwives after maximizing the friendship of each.
Soul Quest. Assemble a Orbiting Soulface Shield consisting of at least 100 sufficiently powerful souls.

Example Quest

Your perfect soul pilots an invincible body to the exact specifications of Your divine will. This body itself consumed the energy created by no less than 17 × 100 lifetimes of unconditional love entirely and unilaterally for You alone. Every second Your existence autonomously consumes at least 100 billions lifetimes of such energy; more than 10 of those "Earths" every single second. Every single Godsperm You've ever produced is itself no less than an entire lifetime of love energy made manifest into a physical form.
...Yet, this is not enough.
I apologize if this comes as a shock, but I am here to deliver an urgent quest of unprecedent importance and can waste no more time. I am here to pled for You to consume more of our love, and consume it faster. At this rate our universe is flooding with so many supernovas of Love Energy for You that existence as we know it is liable to pop. As far as our researchers understand, fucknukes are the fastest way to burn through our love that is Your fuel. Outside I have gathered an army of 120 genies who are eager to grant any and every wish that could lead to Your greatest fucknukes. Allow me to dogeza my nose to the floor as I humbly request, as I beg: Please, save us all."