The German has lead Chelsea into the FA Cup and Champions League finals, as well as the Premier League top-four.
Arteta's team still have a slim chance of finishing in the Europa League spots and will be hoping to win three more points when they face Chelsea on Wednesday.
"Probably they've been the best team in the league in the last few months, what Thomas [Tuchel] has been able to do since he arrived has been exceptional," Arteta said.
"He put the team in two finals, the way the team is looking, how solid they are defensively as well, how composed and regular they have been in their performance has been excellent.
"I think it is the pride in the shirt that we wear [that motivates us], and that we want to win.
"Winning is going to put us in a much better position in the table, which is going to make us… the chance to finish where is mathematically possible, but it doesn't depend on us at the moment."