What about actual accomplishments?

How do you guys give yourself a true reflection of actual verified accomplishments? I also try to undermine them or downplay them, I honestly don’t know why, maybe it’s because grandiose thinking is one of the symptoms? Or Im afraid it’d trigger a manic episode? I’m talking about accomplishments that even others can see that it’s an accomplishment not something that i play in my head, examples being graduating college or working in a globally renowned company etc. *I’m not manic thankfully for anyone who might be concerned * I genuinely need insight on this.