The phrase "achieved back in" is correct and usable in written English.
It can be used to refer to a specific accomplishment that occurred in the past, often indicating a particular time frame.
Example: "The project was successfully achieved back in 2015, setting a new standard for our industry."
Alternatives: "accomplished in" or "attained in".
This they achieved, back in the glory days of the 1980s, with the creation of a revolutionary perpetual calendar that remains accurate (with one tiny adjustment in the year 2100) until 2499.
Hyundai Motor India registered a growth of 9.7% over the same month last year, however it failed to exceed monthly sales of 40,000 units, which was the highest record achieved back in August last year.
The device achieved backing on Kickstarter in February and originally planned to start shipping in March, with "fulfilment to customer" pegged for April.
In 2009 and 2010, the Jets achieved back-to-back appearances in the AFC Championship Game, losing to the Indianapolis Colts and Pittsburgh Steelers.
"They have now achieved back-to-back wins in the four-day format and are targeting the teams above them, such is the uplift to morale that the winning habit brings".
Evans guided the side to promotion from League two last season, his first with the club, and is looking to emulate Ronnie Moore's Millers side that achieved back-to-back promotions in 1999-00 and 2000-01.
The Cubs achieved back-to-back division titles in 2007-8, but were swept in the first round of the playoffs each year.
Donal laid out the opportunity for us: "The Lions are 125 years old and in all that time only once have they achieved back-to-back Test- series wins, in 1971 and 1974".
His debut season in the Championship was good as the Canaries achieved back-to-back promotions - and in the Premier League, Ruddy has been superb, pulling off 216 saves as the club achieved mid-table security.
Then Webb achieved back-to-back breakthroughs.
"I think if you'd offered me what the club has gone on to achieve back on that day in 2002 I would have snapped your hand off".
