Cat Quest
12 Achievements
20-25h
Super Catventurer
Reached level 99
13.6%
How to unlock the Super Catventurer achievement in Cat Quest - Definitive Guide
An easy way to finish this out though, in the cave called "Hidden Cave" Lv 99. NorthEastern side of the map and just south of Death Isle. Once clearing the first 2 mobs and then all 3 dragons, you should be gaining at ~2 levels per clear. Thus grinding this cave a handful of times to finish out the lvl 99 trophy.
Go to a nearby inn after killing all of them to save and exit to main menu, then reload to spawn these enemies again. Repeat until you get lvl 99.
This will probably be one of the last trophies you get in the game. For the majority of the game, just keep killing enemies but also make sure you are trying to get as many of the side quests as you can as well as that is where you are going to get huge chunks of experience by finishing them. When you have completed the main game and all the side quests, you should be pretty high level and only have to grind out a little bit more to reach level 99. The best place to go for high experience is the Hidden Cave (just South of the Death Isle) as there are 2 flame dragons and a hidden ice dragon to kill in there, as well as smaller other misc enemies that by killing them all will give you a level or two boost each time you clear the dungeon. Just keep killing enemies and levelling up, then the trophy will pop when you get to level 99.