Goals from Robert Snodgrass, Grant Holt, Jonny Howson and an own goal from former Ipswich defender Gareth McAuley earned the Canaries a 4-0 win over West Brom to secure safety.
"Staying in this league for Norwich City is a massive achievement, it's as simple as that," said England goalkeeper Ruddy, who was a spectator for much of the match as he made his first appearance since November following a thigh injury.
"It was the same feeling when we got up from the Championship and the same feeling last year when we knew we were safe.
"We just knew what we had to do. Since last week there's been a lot of pressure and a lot of hype, but Wigan losing in midweek helped us massively.
"It's always nice to have it in your hands, not have to rely on other teams' results.
"The midweek Wigan result and Villa's result helped us massively and we knew what we had to do.
"It's always been about us this season, no matter how we've played. We're never looking over our shoulder.
"We want to be in the Premier League on our merit, not because other teams faltered.
"We gave ourselves the best possible chance with a 10-game [unbeaten] run earlier on in the season. We've been a bit patchy since then, but we turned it on and that's all that matters.
"We just knew coming into this game we had to win and we relaxed a bit and played with a bit of freedom. We showed what we're about and what we can do."