Here is the full list of all 50 WarDogs: Red's Return achievements.
Defeat 35 Enemies
Defeat 90 Enemies
Defeat 150 Enemies
Defeat 280 Enemies
Defeat a Boss
Perform Techniques 15 Times
Perform Techniques 35 Times
Perform Techniques 70Times
Perform Techniques 120 Times
Deliver 500 Blows
Deliver 1000 Blows
Deliver 2000 Blows
Deliver 3500 Blows
Use a Weapon Until It Breaks
Use 5 Weapons Until They Break
Pick Up a Health Boost
Pick Up a Rage Boost
Pick Up 10 Boosts.
Clear Story Stage 1: "Homecoming".
Clear Story Stage 1 with Rank S.
Clear Story Stage 2: "Back in Business".
Clear Story Stage 2 with Rank S.
Clear Story Stage 3: "Down into the Abyss".
Clear Story Stage 3 with Rank S.
Clear Story Stage 4: "Chasing Shadows".
Clear Story Stage 4 with Rank S.
Clear Story Stage 5: "End of The Line".
Clear Story Stage 5 with Rank S.
Clear Story Stage 6: "Down Memory Lane".
Clear Story Stage 6 with Rank S.
Clear Story Stage 7: "A Descent into Hell".
Clear Story Stage 7 with Rank S.
Clear Story Stage 8: "Last Stand".
Clear Story Stage 8 with Rank S.
Go Berserk for the first time.
Break a bottle.
Use 15 Weapons Until They Break.
Pick Up 25 Boosts.
Clear Story Stage 1 on Hard difficulty.
Clear Story Stage 2 on Hard difficulty.
Clear Story Stage 3 on Hard difficulty.
Clear Story Stage 4 on Hard difficulty.
Clear Story Stage 5 on Hard difficulty.
Clear Story Stage 6 on Hard difficulty.
Clear Story Stage 7 on Hard difficulty.
Clear Story Stage 8 on Hard difficulty.
Own 5 cosmetic items.
Own 15 cosmetic items.
Own 30 cosmetic items.
Own all cosmetic items.