The Season Journey was first introduced into Diablo III during Season 4.
It is back for Season 5, but is not exactly the same as it was in Season 4. The small changes keep things interesting.
Players who complete the Season Journey through Chapter 4 will receive a portrait frame, a pet, and an entire set of armor. The opportunity to earn an entire set of armor is something new for Season 5.
The screenshot above shows what Chapter 2 of the Season Journey looks like. In general, it is possible to complete objectives on Chapters that you have yet to open, simply by doing the thing that is required. The Achievement Toast will pop up to let you know when you have completed an objective that you can’t see yet.
Friends With Benefits: Fully equip one of your followers.
Hard: Complete a Nephalem Rift on Hard difficulty or higher.
Build Me Up Buttercup: Craft an item at the Blacksmith.
A Life With Meaning: Raise the Blacksmith to level 10. Leveling up the Blacksmith unlocks access to higher level weapon and armor recipes.
Kanai’s Excellent Adventure: Find Kanai’s Cube. Kanai’s Cube can be found in Act III in The Ruins of Sescheron. Kanai’s Cube can be used for very powerful things such as extracting Legendary Powers and upgrading Rare items into Legendary items.
Just A Hobby: Raise the Jeweler to level 10. Leveling up the Jeweler unlocks access to higher level gem recipes.
Watch Yourself: Raise the Mystic to level 10. Leveling up the Mystic enables her to enchant more item types and unlocks new Transmogrify looks.
Hero of Sanctuary: Reach level 60.
Ghom Nom Nom: Kill Ghom at level 60 or higher on Hard difficulty.
Fresh Static Snow: Kill Izual at Level 60 or higher on Hard difficulty or higher.
This is what Chapter II of the Season Journey (in Season 5) looks like when you complete it. A shiny ribbon appears!