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Charlton clinched Championship safety with a 3-1 home win over 10-man Watford on Tuesday night.
Callum Harriott scored his first two goals of the season to move the Addicks up to 18th place - five points clear of the bottom three with one game left.
Boss Jose Riga, whose short-term deal expires at the end of the season, is delighted to have led Charlton to safety.
He said: "I've won some titles but this one is similar to a title.
"It means more. I've been here two months and we've competed with the other teams playing so many games but the first thing is that I am very happy for the players.
“All of the players involved in the club, the staff, people working hard. I'm very proud of what they have done.”
Harriott collected a pass from Jordan Cousins and fired across Jonathan Bond from outside the area to give Charlton the lead on 22 minutes.
Watford levelled through Troy Deeney's thumping volley on the hour but the Addicks went back in front on 77 minutes when captain Johnnie Jackson finished Morgan Fox's cross at the second attempt.
Harriott secured victory with a smart finish from Lawrie Wilson's cross on 77 minutes.
The Hornets were reduced to 10 men when former Liverpool midfielder Albert Riera was shown a second yellow card two minutes later.