Rare have taken to their YouTube channel to release the first developer update detailing their progression through Sea of Thieves' problems.
Craig Duncan and Joe Neate run players through the current long list of problems that Sea of Thieves is facing. Neate discusses the some of the main issues that players have, and further details how the developers are on track to reprimand these problems and get the game on track to where it should be.
According to both Duncan and Neate the problems surrounding achievements was due to letting a massive influx of players on the servers once the game went live, this caused numerous problems. The developers decided to turn off the achievement feature so more players could enjoy the Sea of Thieves experience at once, simultaneously Rare has stored achievements server side for each player so no one misses out. This should result in players logging in and gaining multitudes of achievements at once throughout this week sometime.