Here is the full list of all 121 Onmyoji achievements.
Clear chapter 14 challenge in hard mode.
Add 20 friends.
Clear chapter 8 challenge in hard mode.
Feed a soul to Lv. 15 for the first time.
Complete "Resurrection of Orochi".
Clear chapter 9 challenge in hard mode.
Clear chapter 13 challenge in hard mode.
Evolve 10 shikigami.
Summon an SSR shikigami.
Clear chapter 12 challenge in hard mode.
Clear chapter 10 challenge in hard mode.
Clear chapter 11 challenge in hard mode.
Complete "Underworld Judgment".
Complete "Upheaval".
Complete "The Way of the Onmyoji".
Clear chapter 5 challenge in hard mode.
Clear chapter 6 challenge in hard mode.
Clear chapter 7 challenge in hard mode.
Win 10 duel.
Defeat a grade 5 Lightning Kirin in a hunt.
Make 50 donations in your guild.
Learn all skills of any 1 onmyoji.
Clear chapter 3 challenge in hard mode.
Clear chapter 4 challenge in hard mode.
Complete "Netherworld Rift".
Clear chapter 2 challenge in hard mode.
Receive 100 heart from a friend.
Complete "Dreamland Encounter".
Complete "Bows and Arrows".
Own a grade 5 shikigami.
Clear chapter 1 challenge in hard mode.
Please accept this gift from us.
Receive 50 heart from a friend.
Complete "Another Seimei".
Own a grade 4 shikigami.
Win 1 duel.
Summon shikigami 100 times.
Login 10 day.
Complete "The Red Maple Forest".
Login 9 day.
Complete "Sakura and Momo".
Complete "An Unlikely Team".
Complete "The Drunken Deity".
Find 20 shikigami shard zone.
Login 6 day.
Login 7 day.
Login 8 day.
Upgrade a shikigami for the first time.
Evolve 1 shikigami.
Win 50 realm raids.
Enter 20 shikigami shard zones.
Login 5 day.
Receive 1 heart from a friend.
Complete "Sparrow Search".
Complete "Zashiki".
Complete "The Seer of Phoenix Forest".
Complete "Ame Onna on the Bridge".
Complete "Mt. Gloom Expedition".
Complete "A Dream Yet Not a Dream".
Complete "The Beautiful Carp".
Activate any 4-piece soul set stat.
Learn a new onmyoji skill for the first time.
Summon shikigami 10 times.
Summon an SR shikigami.
Find 1 shikigami shard zone.
Enter 1 shikigami shard zones.
Add 1 friends.
Login 1 day.
Login 2 day.
Login 3 day.
Login 4 day.
Complete "Perilous Ritual".
Complete "Secrets of Mt. Septem".
Complete "Orochi's Scheme".
Complete "Sleeping Puppeteer".
Complete "Heian Tales: Mujou Apprentices".
Complete "Heian Tales: Sakura Fest".
Equip a grade 6 soul for the first time.
Evolve 20 shikigami.
Evolve 50 shikigami.
Own 1 Lv. 40 shikigami.
Own 2 Lv. 40 shikigami.
Own 5 Lv. 40 shikigami.
Own 8 Lv. 40 shikigami.
Onmyoji reaches Lv. 60.
Feed 1 totem to Lv. 40.
Feed 2 totem to Lv. 40.
Feed 3 totem to Lv. 40.
Feed 4 totem to Lv. 40.
Clear a stage-10 Soul zone.
Clear stage 10 of any Evo zone.
Clear chapter 15 challenge in hard mode.
Clear chapter 16 challenge in hard mode.
Clear chapter 17 challenge in hard mode.
Clear chapter 18 challenge in hard mode.
Clear side-chapter 1 challenge in hard mode.
Clear chapter 19 challenge in hard mode.
Clear chapter 20 challenge in hard mode.
Clear chapter 21 challenge in hard mode.
Clear chapter 22 challenge in hard mode.
Clear chapter 23 challenge in hard mode.
Win 30 duel.
Win 100 duel.
Add 50 friends.
Defeat a grade 5 Wind Kirin in a hunt.
Defeat a grade 5 Fire Kirin in a hunt.
Defeat a grade 5 Water Kirin in a hunt.
Own a grade 6 shikigami.
Feed soul 100 times.
Clear a stage-10 Ultimate Orochi zone.
Win 6 Royal Battles.
Win 9 Royal Battles.
Win 12 Royal Battles.
Win 10 Royal Battles using only R shikigami.
Win 10 Royal Battles using only SR shikigami.
Win 10 Royal Battles using only SSR shikigami.
Win 20 Royal Battle duels using the exact same formation as your opponent.