Here is the full list of all 62 Nexomon achievements worth 1,000 gamerscore. It takes around 30-35 hours to unlock all of the achievements on Xbox One.
Battle Omnicron and become the new Nexolord!
Capture 10 wild Nexomon.
Capture 120 wild Nexomon.
Capture 180 wild Nexomon.
Capture 240 wild Nexomon.
Capture 30 wild Nexomon.
Capture 300 wild Nexomon.
Capture 60 wild Nexomon.
Capture the legendary Electric-type Nexomon, Luxa.
Capture the legendary Fire-type Nexomon, Fona.
Capture the legendary Mineral-type Nexomon, Grunda.
Capture the legendary mystery, Metta.
Capture the legendary Plant-type Nexomon, Nara.
Capture the legendary Warden of Fire, Ogoon.
Capture the legendary Warden of Mineral, Titan.
Capture the legendary Warden of Plant, Tikala.
Capture the legendary Warden of Thunder, Krowr.
Capture the legendary Warden of Water, Darine.
Capture the legendary Warden of Wind, Hexia.
Capture the legendary Water-type Nexomon, Arqua.
Capture the legendary Wind-type Nexomon, Ventra.
Capture the ultimate Nexomon, Omnicron.
Catch your very first Nexomon.
Collect all 41 Nexomon fragments and get the radar.
Collect all monsters. A true master!
Defeat 10 tamers.
Defeat 20 tamers.
Defeat all tamers.
Defeat Fenrir, the embodiment of pride.
Defeat Grunda, the underground beast.
Defeat Merida in a volleyball match! Easiest win ever.
Defeat Merida, the terror of the ocean.
Defeat Nadine, the sky menace.
Defeat Omnicron (again) and save the world (again). Congratulations!
Defeat Omnicron in the ultimate battle.
Defeat Overseer Glacia, the jealous one.
Defeat Overseer Hilda, master of the paranormal.
Defeat Overseer Ira, the fire rocker.
Defeat Overseer Ivan. That's hardly an accomplishment, though...
Defeat Overseer Remus, a man who knows no fear!
Defeat the Warden of Fire, Ogoon.
Defeat the Warden of Mineral, Titan.
Defeat the Warden of Thunder, Krowr.
Defeat the Warden of Water, Darine.
Defeat the Warden of Wind, Hexia.
Defeat Zetta, the raging thunder.
Enter the mysterious Netherworld and complete your mission.
Get your very first Nexomon. Now go and save the world, champ!
Own a level 30 or above Nexomon.
Own a level 30 or above reborn Nexomon.
Own a level 60 or above Nexomon.
Own a level 60 or above reborn Nexomon.
Own a level 99 or above Nexomon.
Own a level 99 or above reborn Nexomon.
Wasn't it obvious?
Win 100 battles on your adventure.
Win 200 battles on your adventure.
Win 300 battles on your adventure.
Win 400 battles on your adventure.
Win 500 battles on your adventure.
Win your first Nexomon battle.
Win your first tamer battle.