The 46-year-old German replaced Chris Powell on November 5 in 2015 and a fourth top-flight win this season would be the perfect anniversary gift.
"I never expected when I signed my first contract for this football club that two years later I'd be sitting here in the Premier League, with 12 points after 10 games," Wagner said.
"This was never in my head. I never dreamed about this. It was totally unrealistic, but we've seen even the unrealistic sometimes happens.
"We have worked on the impossible since I arrived. We've always tried to over-achieve and the club has done this perfectly so far."
The Terriers are two places above seasoned Premier League campaigners West Brom after following up their memorable recent win against Manchester United with defeat at Liverpool last week.
Wagner told his players he expected nothing more than whole-hearted individual performances in both those matches, but knows the visit of Tony Pulis' side offers them a more realistic challenge.
"It's not business as usual because this is a Premier League game and we're not used to playing Premier League games," he said.
"It's a proper Premier League game and very exciting for the club and it's a great game because it's a home game.
"Is it a game where I feel we have a bigger chance that if we're playing Liverpool away? Yes of course it is.
"But it doesn't guarantee that you're going to be successful. You have to make sure you are at your best."