Full list of all 29 Next Up Hero achievements worth 1,000 gamerscore. It takes around 20-25 hours to unlock all of the achievements on Xbox One.
Got killed by every unique enemy in the game
Unlocked 35 Abilities
Participated in a Venture which gets completed with at least 500 Levels
Participated in a completed, Epic Length Venture
Defeated 100 Dark Heroes
Successfully navigated a Darkness Level
Unlocked 9 Prestige Characters
Participated in a completed, Long Length Venture
Killed 3 Enemies with 1 Prestige Paladrin Shield Throw
Raised 15 Symposer Echoes in a single level
Chose to Extend a Venture
Chose to Kill a Boss
Controlled a Follower while Spectating
Completed a Venture with a 'S' Rank
Complete a Venture with a 'AAA' Rank
Defeated 100 Buckles
Completed 5 straight levels, without dying, on a single playthrough
Raised up the Echo of a Registered Streamer
Summoned 8 using Ancients
Completed a Venture with a 'A' Rank
Successfully completed a Mayhem Level
Summoned 4 Ancients on a single level
Raised up 15 Echoes in a single level
Raised 10 of the same House Echoes in a single level
Completed a Venture with a 'AA' Rank
Invested enough Prestige to trigger a random Rare Enemy
Successfully completed a Single Enemy Encounter
Successfully completed a Time Limit Trial Level
Had your Hero Die