This lists Badges that are currently made on this Wiki
Sudden Changes Badge: You had to give Sudden Changes Sans a coffee and then he would say: "thanks kiddo! I'll help ya from time to time." and then you would get Sudden Changes Sans. (was a event)
??? (Badge): To get this, you had to go the the CORE, and then there would be a door. You would then go in it, and then Gaster would be there. you would get a stick that does 100 damage, and once you beat him you would get the badge and the Gaster character. (was a event )
Insanity (Badge): You used to be able to get this by defeating Hard Mode Insanity Sans. (was an event)
Reset (Badge): to get this: you need 2000 wins and then reset: and once you do this: you should get a Rainbow Soul and Seraphim Sans.
Error404: Page Not found: Obtainable by reaching 10,000 wins and equipping Error 404.
Christmas 2020 (Badge): Used to be obtainable by using presents bought from Sansta or finding them in the lobby, and the presents had a low chance to the badge which unlocks the Sansta character along with Candy Cane Sword.
No More Deals (Badge): Used to be obtainable by defeating No More Deals Chara in battle. (Was an event)
Rejuvenation: Used to be obtainable by fighting Sans (Rejuvenation Event NPC) and defeating him.
Spare (Badge): Was obtainable by sparing Pacifist Sans Phase 1. (was an event)
No Mercy (Badge): Used to be obtainable by fighting Pacifist Sans Phase 1 and defeating phase 2.
... (Badge): Is obtainable by fighting DustDust Sans (Battle NPC) and defeating him.
Halloween2021 (Badge): Was obtainable by getting 3 souls and 100 kills, then talking to Reaper who would have rewarded you with Death.
Christmas 2021: Was obtainable by getting a gift from Nightmare and getting the badge by chance. It would have rewarded Krampus.
April Fools 2022 (Badge): Was obtainable by talking to Super Science Sans in the lobby and completing his quests.
ReaperCharaBadge (Badge): Was obtainable by finding a portal that spawns every hour in the Lobby, and then fighting Death Sans and beating him.
Halloween2022 (Badge): Was obtainable by talking to Pumpkin sans (NPC) in the Lobby and completing his quests.
Christmas 2022 (Badge): Was obtainable by beating Krampus in his boss fight and getting the badge by chance from his gift. It would have rewarded Ice Magic.
Error404 (Badge): Is obtainable by beating ERROR 404 in The Mirrored Realm. It will likely result in a permanent ban due to being exploiter bait.
Sansposter (Badge): Is obtainable by fighting Sansposter (Battle NPC) in The Mirrored Realm and defeating him.
TimeParadox (Badge): Is obtainable by fighting TimeParadox (Battle NPC) in The Mirrored Realm and defeating him.
Tears In The Rain (Badge): Is obtainable by fighting Tears In The Rain ((Phase 2) Battle NPC) in The Mirrored Realm and defeating him.
Dusttrust (Badge): Is obtainable by beating Dusttrust Sans (Phase 3) in The Mirrored Realm.
Error (Badge): Is obtainable by beating Error Sans in The Mirrored Realm.
Eyes (Badge): is obtainable by getting the 1/600k chance by leaving and rejoining and going into The Mirrored Realm.