Here is the full list of all 62 Nexomon achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Capture 10 wild Nexomon.
Defeat Ivan, the Overseer! That's hardly an achievement, though.
Win your first tamer battle!
Catch your very first Nexomon!
Beat a minion in your first real Nexomon battle!
Get your very first Nexomon! Now go and save the world, champ!
Defeat Remus, a man who knows no fear!
Defeat Ira, the rocking Overseer of Fire!
Defeat Hilda, the master of the paranormal.
Wasn't it obvious?
Defeat Glacia, the jealous Overseer who won't let it go...
Defeat Merida in a volleyball match! Easiest win ever!
Defeat Nadine, the sky menace.
Defeat Merida, the terror of the ocean!
Defeat Grunda, the underground beast.
Defeat Fenrir, the embodiment of pride.
Defeat Zetta, the raging thunder.
Defeat Omnicron, the ultimate battle!
Capture the legendary wind Nexomon Ventra!
Capture the legendary fire Nexomon Fona!
Capture the legendary Mineral Nexomon Grunda!
Capture the legendary water Nexomon Arqua!
Capture the legendary plant Nexomon Nara!
Capture the legendary electric Nexomon Luxa!
Capture the legendary mystery Metta!
Capture the ultimate Nexomon Omnicron!
Capture 60 wild Nexomon.
Capture 120 wild Nexomon.
Capture 180 wild Nexomon.
Capture 240 wild Nexomon.
Capture 300 wild Nexomon.
Collect all monsters! A true master!
Capture 30 wild Nexomon.
Defeat 10 tamers in battle around the world!
Defeat 20 tamers in battle around the world!
Defeat ALL tamers in battle around the world!
Win 100 battles in your adventure!
Win 200 battles in your adventure!
Win 300 battles in your adventure!
Win 400 battles in your adventure!
Win 500 battles in your adventure!
OWN A NEXOMON LEVEL 30+.
OWN A NEXOMON LEVEL 60+.
OWN A NEXOMON LEVEL 99+.
Battle Omnicron and become the new Nexolord!
Enter the mysterious Netherworld and complete your mission!
Defeat the warden of water Darine!
Defeat the warden of wind Hexia!
Defeat the warden of thunder Krowr!
Defeat the warden of fire Ogoon!
Defeat the warden of Mineral Titan!
Capture the legendary warden of water Darine!
Capture the legendary warden of wind Hexia!
Capture the legendary warden of thunder Krowr!
Capture the legendary warden of fire Ogoon!
Capture the legendary warden of plant Tikala!
Capture the legendary warden of mineral Titan!
Collect all 41 Nexomon fragments and get the radar!
Own a reborn Nexomon and reach level 30+.
Own a reborn Nexomon and reach level 60+.
Own a reborn Nexomon and reach level 99+.
Defeat Omnicron (again) and save the world (again)! Congratulations!