Speaking of stuff they found out on the Defiant, here's a picture of Archer's bio on one of the screens. It includes the following info about his future after commanding the NX-01:
Rank at Retirement: Admiral, Chief of Staff, Starfleet Command
Ambassador to Andoria – 2169-2175
Federation Councilman – 2175-2183
President, UFP – 2184-2192
I found it at Memory Alpha.
. . . just an old-school Trekker getting by in a newfangled galaxy.