To score this trophy/achievement, you need to accrue a cumulative 100,000 Research Points - you need not possess 100,000 Research Points at one time, thankfully.
You’ll earn Research Points by examining monster tracks (a vital part of hunting), gathering at various resource nodes in areas, by completing bounties, by breaking monster parts in battle, and by witnessing turf wars between monsters. This requires an awful lot of playing, but if you’ve a mind to get other, even more grinding-intensive trophies, you need not go out of your way to specifically farm Research Points - they’ll come as you pursue other, loftier goals. If you must grind Research Points, however, seek out Beryl and Amber desposits in the Elder’s Recess. Intensive harvesting runs could earn you several thousand Research Points per run.