Feat Tiers:
Bronze: Bronze feats are feats that are usually possible for unpowered people to achieve but are still notable accomplishments. Like pickpocketing 10 people in a row without being caught, hunting wolves for the first time, winning a roughly equal fight against an unpowered person, being hired at a job, etc.
Silver: Silver feats are feats that actually enter into the realm of supernatural or peak human, or less depending on how far along you are. For example, putting on a show that impresses a large crowd, earning 10,000 dollars in one day, taking down a gang in their own hideout, killing a bear with your bare hands, taking down an adversary capable of breaking down walls and slaughtering a crowd etc.
Gold: Gold feats are feats that are firmly in the impressive category. If you can do these it must mean you are pretty impressive yourself. Such as pulling off a giant heist at a guarded bank, escaping likely death sentence, seducing a very notable person, or winning against an enemy capable of causing a lot of destruction like the Bat Devil(Chainsaw Man)
Platinum: Platinum feats are not just impressive anymore, they are true accomplishments. Such as breaking a record that you had no right to break, escaping almost certain death, pacifying a being massively stronger than you are, defeating formidable foes who can level entire city blocks with their attacks like a skyrim dragon.
Diamond: Diamond feats are truly extraordinary and rare, being feats that are truly beyond the ordinary. These are feats like seducing Satan's wife, helping fend off the chitauri invasion, contract a truly powerful dragon as a familiar, save a city from doom, slay an opponent like the Nomu(MHA). These are feats that are truly epic.
Legendary: Legendary feats are as their names say, Legendary feats, things that would put a legend on your name, something no normal person can accomplish. These are feats like steal Thanos' gauntlet off of his hands, slay a legendary dragon, tear the wings off of an arch angels back, save an entire country or even the planet from a legendary threat, seduce a real god, kill a being like full power Shigaraki Tomura(MHA), win the Holy Grail War(Fate). These are feats only stuff of legends can do.
Mythical: Mythical feats are feats that puts you shoulder to shoulder with divine beings. You accomplish feats only godlike beings could hope to achieve, most lower worlds cannot even reach such a height. These are feats like saving the entire planet from a prophecy, besting the Sword Saint(Re:Zero), seducing Lady Death(Marvel), conquering a high rank world, defeating the Dragon King(Acnologia), stealing Gilgamesh's Treasury(Fate), pacifying Scion(Worm). Mythical feats are those that shake the universe at their foundation.
Divine: Divine feats are finality, feats that cannot be compared and cannot even be accomplished under normal circumstances. Feats that put you on part with even the strongest of beings in existence. Feats such as defeating Scion(Worm), defeating Goetia by yourself(Fate), conquering an entire high tier world/universe, defeat the Justice League, rob Darkseid blind, seduce Darkseid, Conquer Earth(Marvel/DC). In general, Divine Feats are proof of your absolute supremacy.
Now of course, do not take these classifications as gospel, adjust the feats according the world your character is in and their circumstances. This is just a guideline or a reference for you to use.