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Here's everyone we know so far, sorted by how they can be obtained:

Battle Royale 12-0 Flawless Reward (Sellable):
90 HW Dale Murphy
90 IV Paul Molitor
91 CP Rob Dibble
89 AS Shawn Green
90 R Walter Johnson

Collect All Rewards (NOT Sellable):
AL East - 92 AS Jose Bautista
Jays - 84 IV Brett Cecil
O's - 82 BO Jonathan Schoop
Rays - 94 IV Fred McGriff
Red Sox - 90 AS Jacoby Ellsbury
Yankees - 90 AS Robinson Cano

Moments Rewards (unsure if sellable):
2016 Cubs World Series - 83 PS Ben Zobrist
Babe Ruth Career - 85 BO Babe Ruth (Pitcher)
Bryce Harper Career - 82 HW Bryce Harper
Willie Mays Career - 87 HW Willie Mays

1st Inning Bosses (sellable):
91 AS Andruw Jones
96 IV Cy Young
95 AS Goose Gossage

Deluxe Choice Pack (Sellable) (bonus for non-Standard editions + XP Reward Path):
87 PS Barry Larkin
87 HW Buster Posey
87 AS Chipper Jones
87 AS Cliff Floyd
87 AS Curtis Granderson
87 BO Frank Thomas
87 BO Ian Kinsler
87 AS Jason Kendall
87 PS Joe Carter
87 R Lou Gehrig
87 HW Mike Schmidt
87 AS Steve Finley
87 R Ted Williams
88 AS Jackie Robinson (LF)
88 PS Stan Musial
88 IV Tony Gwynn
88 HW Kerry Wood
89 BO Bob Feller
89 R Roy Oswalt
89 BO Tom Seaver

87 BO Rickey Henderson
87 BO Johnny Damon (Royal)
87 BO Robin Yount
87 AS Matt Holliday
87 BO Cal Ripken Jr
87 AS Torii Hunter
88 AS Evan Longoria
88 HW Felix Hernandez
88 PS Gary Carter
89 IV Nolan Ryan (Angels)

Ranked Season April Awards (Sellable):
Pennant Race - 
83 BO AJ Burnett
84 AS Ken Griffey Sr
82 BO Paul Konerko
World Series - 
90 AS Bret Boone
95 IV Christy Mathewson
94 HW Don Mattingly

Team Affinity Awards (NON Sellable):
OAK 10 - 75 BO Jason Giambi
OAK 25 - 81 AS Sonny Gray
OAK 50 - 85 BO Josh Donaldson
STL 10 - 76 AS Bruce Sutter
STL 25 - 82 R Rogers Hornsby
STL 50 - 85 BO Bob Gibson 
SEA 10 - 77 R James Paxton
SEA 25 - 83 AS Kyle Seager
SEA 50 - 87 AS Jay Buhner
SD 10 - 78 BO Andrew Cashner
SD 25 - 80 R Luke Gregorson
SD 50 - 85 BO Chase Headley
DET 10 - IV Justin Wilson
DET 25 - IV Pudge Rodriguez
DET 50 - 91 HW Hal Newhouser
BAL 10 - 77 HW Eddie Murray (from Gamestop Monday Diamond Dynasty Video)

XP Reward Path (NON Sellable):
SIGNATURE 99 Brooks Robinson
SIGNATURE 99 Duke Snider
SIGNATURE 99 Frank Thomas
SIGNATURE 99 Tony Gwynn
SIGNATURE 99 Joe Morgan

Conquest (unsure if sellable):
88 ?? Ty Cobb - Beat USA [h/t: arcticmonkygoaly ]
?? ?? Eric Gagne - Beat 2nd of 4 Conquest Maps (unconfirmed) (2007 Rangers)
?? ?? Keith Hernandez - Beat 3rd of 4 Conquest Maps (unconfirmed)

Cards we have seen, but don't know how to acquire yet:
?? HW Albert Pujols (Gamestop Monday Legend/FB video)
?? AS Bartolo Colon (Gamestop Monday Legend/FB video)
?? ?? Rickey Henderson (Gamestop Monday Legend/FB video)  (1981 Topps)
?? AS Jason Giambi (Flashback/Legend Collect Menu)
82 AS Babe Ruth (Flashback/Legend Collect Menu)
83 IV Jason Heyward (3/11 tweet)
86 BO Brian McCann (Flashback/Legend Collect Menu)
86 IV Brian Dozier (3/12 tweet)
99 SIGNATURE Willie Mays (Gamestop Monday Diamond Dynasty Video)  (wasn't "confirmed" 99, but come on...)

Card we heard about but haven't seen:
?? SIGNATURE Chipper Jones


That's all I know of so far.  Be sure to add if you know of anything.

3/19/2019 9:54AM PDT

88 Ty Cobb Is From USA Map Conquest

3/19/2019 10:18AM PDT
See original thread.