Missible!
For this trophy, you must collect 15 Gorgon Eyes to fully upgrade your health to maximum. There are plenty of opportunities to collect these as there are more than 15 Gorgon Eyes in the game. Once you've collected the 15th Gorgon Eye, this trophy will be yours. All other Gorgon Eyes chests found later in the game will turn into red orbs chest with either green/blue orbs
This is PowerPYX's guide. All credit goes to his fantastic work. He list all 45 colelctible's unlike playstationtrophies which only site first 15 of each.
http://www.powerpyx.com/guides/god_of_war_ghost_of_sparta.ht...