Let's break it down---
2 more games in Detroit. Split them.
1-1
Come home for 10 games. Home cooking against the Twins, Royals, and Tigers. Win more than you lose.
6-4
Hit the road for 9 games. Twins, Royals, and Angels. Win more than you lose.
5-4
Come home for 7 games. Indians and Rays. Win more than you lose.
4-3
Finish at Cleveland for 3. Win more than you lose.
2-1
That's 90 wins and should be good enough. And should be attainable for a first place team. If they don't win 90 games, it's a choke job if they don't make the playoffs, and if they do make the playoffs, they're backing in.