Here is the full list of all 51 WWE 2K20 achievements.
UNIVERSE: Activate a potential Rivalry.
UNIVERSE: Complete a Month of Shows.
Win by performing a Pin Combo through a Signature or Finisher. (PLAY mode against A.I.)
Use Payback Instant Recovery to quickly rise after being knocked down. (PLAY mode against A.I.)
Use Payback Spray Poison Mist to your opponent's face. (PLAY mode against A.I.)
Activate the Run-In Payback. (PLAY mode against A.I.)
Hit your Finisher immediately after activating Blackout Payback. (PLAY mode against A.I.)
Use the Tank buff to minimize damage from your opponent's Finisher. (PLAY mode agaisnt A.I.)
Use Payback Low Blow to slow your opponent down. (PLAY mode against A.I.)
Finish your opponent using a possum pin. (PLAY mode against A.I.)
Defeat your opponent with their own Finisher. (PLAY mode against A.I.)
Put your opponent through the top of the cell. (PLAY mode against A.I.)
Steel Cage: Escape through the door. (PLAY mode against A.I.)
Steel Cage: Push off an opponent from atop the Cage. (PLAY mode against A.I.)
Win a Title by cashing in your custom MITB. (PLAY mode against A.I.)
SHOWCASE: Clear all matches.
MyPLAYER TOWERS: Complete one Tower.
2K CENTRAL TOWERS: Clear Roman Reigns' Tower
MyPLAYER: Reach Prestige Rank 2.
ROAD TO GLORY: Win 50 matches.
ROAD TO GLORY: Win 10 matches.
ROAD TO GLORY: Win a Main Event in a PPV.
UNIVERSE: Play and Win 50 matches.
Use Payback Rush to steal 3 finishers in one match.
Use Payback Fortify to deflect 1000 total damage.
Win a Royal Rumble as entrant #1 or #2 against AI.(PLAY mode against A.I.)
PLAY: Take control of a Superstar and win a Tournament against AI with "DAMAGE RETENTION" enabled.
Equip a Favorite Foreign Object and grab it from under the apron.
CREATIONS: Create your own Arena.
UNIVERSE: Complete a year of universe.
CREATIONS: Create a unique Superstar with their own Move-set, Entrance, and Victory pose.
Play one Match using Assist Mode. (PLAY mode against A.I.)
MyPLAYER: Complete a Side Plate.
STORE: Open a Loot Pack.
As a Tag Team, perform your Tag Team Move. (PLAY mode against A.I.)
MyPLAYER: Use a Boost in a match.
UNIVERSE: Create a new Major Show in Universe.
Perform a Dual Attack in a Mixed Gender Match. (PLAY mode against A.I.)
Send your Opponent through a table. (PLAY mode against A.I.)
Reverse a Finisher. (PLAY mode against A.I.)
Break free from a Carry. (PLAY mode against A.I.)
Defend successfully against elimination in a Royal Rumble match. (PLAY mode against A.I.)
Attack a Groggy Opponent with a Diving Attack from the Top Rope. (PLAY mode against A.I.)
Break out of a Submission without overlapping once. (PLAY mode against A.I.)
Finish an opponent without landing a finisher or signature. (PLAY mode against A.I.)
Attack an opponent with the Tripod Foreign Object (PLAY mode against A.I.)
Use the Adrenaline Payback to Carry an opponent over your weight class. (PLAY mode against A.I.)
MyCAREER: Clear Chapter 1.
MyCAREER: Clear Chapter 4.
MyCAREER: Clear Chapter 10.
MyCAREER: Clear Chapter 18.