Here is the full list of all 30 Endless Battle: Return of Hero +1 achievements.
Unlock the Wilderness
Unlock the Village
Unlock the City
Unlock the Kingdom
Unlock C.T.T.O.S.
Unlock the Monster Nexus
Unlock the Space Between Worlds
Unlock the Known Universe
Unlock the P.A.R.
Reach ending 1A
Reach ending 1B
Find a 1 star item or character
Find a 2 star item or character
Find a 3 star item or character
Find a 4 star item or character
Find a 5 star item or character
Reach 250 milestones
Reach 500 milestones
Reach 750 milestones
Reach 1000 milestones
Reach 1250 milestones
Reach 1500 milestones
Reach 1750 milestones
Reach 2000 milestones
Reach 2250 milestones
Reach 2500 milestones
Reach 2750 milestones
Reach 3000 milestones
Reach all milestones
Completely fill in the compendium