Trulon: The Shadow Engine
16 Achievements
Glass Ceiling
Hit the level cap with a character
13.6%
How to unlock the Glass Ceiling achievement in Trulon: The Shadow Engine - Definitive Guide
The max level for this game is 30 and the first character that will reach level 30 is Gladia. Once you get to the end of the game you should be close to level 25 which means you will have a couple levels to go. I personally just walked around the overworld running into enemies and beating them as quickly as possible. The max amount of XP I got from a battle was 7250 while my lowest amount was 150, there is no way to guarantee a high amount of exp for a battle due to the enemies being random so the time to get this achievement will vary depending on what you run into.
The highest level you can reach in the game is Level 30. You will probably not hit this before getting to the final boss, so make sure you turn back and go to the overworld to fight random encounters until you get Gladia to Level 30. If you're going for the speed run achievement and you're nearing the five hour mark, I would suggest getting that and starting a new game for this since that is the harder of the two to earn.
NOTE: If you're grinding in the Maleon area, never fight the white robots. You will get almost no experience for some reason. I think it's just glitched and only the other enemies in the fight award xp. To be safe, just grind in the first area of the game near Meadow Hills. You'll average 3-5k per battle.