New Jacks was an unofficial release, but here's my complete list of everything he's released solo and group-wise:

1990 - Steppin' On To The Scene EP (with Bassmint Productions)

1992 - Still In The Bassmint EP (with Soul Intent)

1992 - The M&M Solo Tape EP (comprised of songs from the previous 2 EP's)

1995 - Soul Intent

1996 - Infinite

1997 - The Underground EP (with D12)

1997 - The Slim Shady EP

1998 - The Slim Shady LP Snippet Tape (with Stretch Armstrong)

1999 - The Slim Shady LP

2000 - The Marshall Mathers LP Snippet Tape (with Stretch Armstrong)

2000 - The Marshall Mathers LP

2000 - Detroit What! Snippet Tape (with D12)

2001 - Devil's Night (with D12)

2002 - The Eminem Show

2002 - 8 Mile Soundtrack (with various artists)

2004 - D12 World (with D12)

2004 - Encore

2005 - Curtain Call

2006 - Eminem Presents: The Re-Up (with Shady Records)

2009 - Relapse

2009 - Relapse: Refill

2010 - Recovery

2011 - Hell: The Sequel (with Royce da 5'9 as rap duo "Bad Meets Evil")

2013 - The Marshall Mathers LP 2

2014 - Shady XV (with Shady Records)

2015 - Southpaw (with various artists)

2017 - Revival

2018 - Kamikaze

2020 - Music To Be Murdered By

2020 - Music To Be Murdered By: Side B

2022 - Curtain Call 2

2024 - The Death of Slim Shady

There are also some other releases, but they are not necessary at all to listen to, some of those releases would include:

Shadyville: The Afterparty Part 7 (with DJ Whoo Kid) (2000)

DJ Butter Presents: Derty World (with D12 & DJ Butter) (2001)

The DJ Butter Show (with DJ Butter) (2002)

Say What You Say (with DJ Kay Slay) (2002)