Might & Magic Heroes VI

HoMM6 campaign order:

• Prologue 1
• Prologue 2
• Stronghold 1
• Sanctuary 1
• Haven 1
• Inferno 1
• Necropolis 1
• Stronghold 2
• Sanctuary 2
• Haven 2
• Necropolis 2
• Sanctuary 3
• Stronghold 3
• Necropolis 3
• Inferno 2
• Inferno 3
• Sanctuary 4
• Stronghold 4
• Haven 3
• Necropolis 4
• Haven 4
• Inferno 4
• Epilogues

Each race only gets 4 missions, time jump between each mission can be weeks to months. During that time other faction missions happen. Not doing the missions in order leads to an incomprehensible game. Also make sure to have at least one Tears and one Blood hero for the last two missions. Can only do the epilogues if you have the proper hero match. If everyone went Tears, you won't be able to do the Blood epilogue, and won't be able to finish the story properly.