U2's career highlight, Achtung Baby (1991) was a single CD with 12 tracks.
The 20th Anniversary Deluxe Edition comprises 2 CDs with 26 tracks total.
The Super Deluxe Edition comprises 6 CDs (with 72 tracks), 4 DVDs, a 92 page hardback book and 16 art prints in a wallet.
The limited, numbered Uber Deluxe Edition is a magnetic puzzle tiled box containing 6 CDs, 4 DVDs, an Achtung Baby double vinyl album plus 5 clear 7" vinyl singles in their original sleeves, an 84-page hardback book (8 pages missing!), 16 art prints in a wallet, a copy of Propaganda magazine, 4 badges, a sticker sheet, and a pair of Bono’s trademark 'The Fly' sunglasses.
Update: James Cameron Edition (April 14, 2016)
Cameron announces that now there will be four Avatar sequels.
