Student or Learner
Canadian Auto Workers, GM reach tentative concessions deal - USATODAY.com
The two sides met through the night and reached agreement about 5:30 a.m. ET.
Can I say "got to agreement" in place of reached agreement?
Newspapers often use telegraphic speech -- so called because telegrams used to be so expensive that people shortened their messages by leaving out articles (the, a) etc.
I've heard that journalistic editors still like to think of page productivity and shortening articles as much as they can.
So, "reached agreement" would probably be written "reached an agreement" or "reached their agreement" or "reached the agreement" at 5:30 AM, if outside journalistic English.
Note that the British "agree" taking a direct object ("they agreed a plan") is not possible in American English.
I don't think "get to" agreement or an agreement sounds normal or correct. To me that phrase sounds more spatial, as in getting to the top of Mount Fuji or the CN Tower.