Here is the full list of all 29 Renegade Grounds: Episode 1 achievements.
Clear the city tunnels.
Clear the underground slums.
Clear the slums streets.
Clear the slums entry.
Clear the Subterranean Cave.
Clear the abandoned mine.
Clear the infernal grounds.
Clear the infernal escape.
Clear the Ashen District.
Clear the Ashen Crossing.
Clear the city outskirts.
Clear the Ceteri Temple.
Find a secret room in the underground slums.
Find a secret room in the city tunnels.
Find a secret room in the Abandoned Mine.
Find a secret room in the Infernal Grounds.
Find a secret room in the Ashen District.
Find a secret room in the Ceteri Temple.
Beat the game on Brazen difficulty.
Find all chests in a single playthrough.
Defeat every enemy in every stage in a single playthrough.
Beat the final boss of story mode without Agela or Ingus being K.Oed.
Survive the first 5 battles in the arena.
Survive the first 10 battles in the arena.
Survive the first 15 battles in the arena.
Survive all 20 battles in the arena.
Defeated the Scorching Golem.
Defeated the Glacial Golem.
Defeated the Obsidian Golem.