I've been a sucker for Trophies ever since they were introduced on PlayStation 3 in 2008. The whole Trophy system -- like the Xbox Achievements that inspired it -- is a fun metagame, a diversion that gives you a reason to play games beyond (!) just beating them. Sure, I've gone through more trouble than I'd like to admit to get some of these digital goodies, but I can't deny that they've added a great deal to my collective gaming experience over the last nearly six years.

Dead Nation: Apocalypse Edition

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Romero Would Be Proud (Platinum): Collect all Trophies.

Don't Starve

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The Silent (Bronze): Unlock Wes.

Killzone: Shadow Fall

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Madden NFL 25

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Madden NFL 25 Master (Platinum): Congratulations on earning every Madden NFL 25 Trophy!

Mercenary Kings

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Coronation (Gold): Clear all missions of the game.

(Gold): Clear all missions of the game. Craftsmanship (Gold): Craft over 100 knifes and 300 gun parts.

(Gold): Craft over 100 knifes and 300 gun parts. Decorator (Gold): Craft 20 Ornaments and 20 Banners.

(Gold): Craft 20 Ornaments and 20 Banners. Five-Star General (Silver): Reach the Five-Star General rank.

(Silver): Reach the Five-Star General rank. Foodie (Bronze): Activate all 14 food skills.

(Bronze): Activate all 14 food skills. Grim Reaper (Bronze): Defeat over 10,000 enemies.

(Bronze): Defeat over 10,000 enemies. Jack of All Trades (Silver): Unlock all Proficiencies.

(Silver): Unlock all Proficiencies. Major Pain (Silver): Clear all Major rank missions without using Rations nor First-Aid kits.

(Silver): Clear all Major rank missions without using Rations nor First-Aid kits. Millionaire (Bronze): Earn over $1,000,000.

(Bronze): Earn over $1,000,000. Pistol Pro (Silver): Clear all 10 Primary missions of the game with the Bolt 45.

(Silver): Clear all 10 Primary missions of the game with the Bolt 45. Speed Runner (Gold): Beat the fastest time of all missions of the game.

(Gold): Beat the fastest time of all missions of the game. The Bionic Merc (Silver): Craft all Bionic Mods.

NBA 2K14

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All Your Trophies Are Belong to Me (Platinum): Earn every Trophy in NBA 2K14.

(Platinum): Earn every Trophy in NBA 2K14. Collect 'Em All (Bronze): Complete the '13-'14 NBA Collection MyTEAM.

(Bronze): Complete the '13-'14 NBA Collection MyTEAM. Not One, Not Two, Not Three... Okay, Just One (Bronze): Win a championship in an online league.

(Bronze): Win a championship in an online league. There's More? (Gold): Complete the Historic Collection in MyTEAM.

Rayman Legends

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Legendary (Platinum): Win all Trophies in the game!

(Platinum): Win all Trophies in the game! Truly Awesome! (Silver): Reach the final level of Awesomeness.

Steamworld Dig

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Master Prospector (Gold): Get all four gold stars in the same playthrough.

TowerFall Ascension

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Battle Stenography (Silver): Earn every award in Versus Mode.

(Silver): Earn every award in Versus Mode. Massive Mythology (Bronze): Play 20,000 rounds of Versus Mode.*

(Bronze): Play 20,000 rounds of Versus Mode.* Tall Tales (Bronze): Play 1,000 rounds of Versus Mode.*

(Bronze): Play 1,000 rounds of Versus Mode.* Thief's Badge (Bronze): Beat 30 diamond times in Trials Mode.

(Bronze): Beat 30 diamond times in Trials Mode. Time Lord (Silver): Complete all 36 stages in Trials Mode, with a total best time of under 2 minutes.

Trophies never did migrate to PSP, but they did go to PlayStation Vita, and now, they can be found on PlayStation 4. And on PS4, like elsewhere, I've always been fascinated by the Trophies that are hardest to acquire. I have 43 Platinum Trophies -- a pretty good count -- and some 5,300 overall, but there are some people out there that have a hundred or more Platinums and many times the Trophy count I do. And many of those people have some of the rarest Trophies imaginable.PlayStation 4's slick Trophy interface shows how rare each Trophy is, and I thought, why not chronicle some of PS4's rarest Trophies as we approach its sixth month anniversary.Let's find out. (Please note that DLC Trophies have been excluded.)(* - These two Trophies are so rare that they're marked as 0.0%.)Do you have any of these "Ultra Rare" 0.1% Trophies listed above? What are your rarest Trophies? Let us know in the comments below those few elusive trophies you just couldn't track down, and we might feature your answer in a future IGN article.

Colin Moriarty is IGN’s Senior Editor. You can follow him on Twitter.