Here is the full list of all 121 Onmyoji achievements.
Complete "Orochi's Scheme".
Complete "Sleeping Puppeteer".
Complete "Heian Tales: Mujou Apprentices".
Complete "Heian Tales: Sakura Fest".
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 2 totem to Lv. 40.
Feed 3 totem to Lv. 40.
Feed 4 totem to Lv. 40.
Clear a stage-10 Soul zone.
Clear chapter 14 challenge in hard mode.
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.
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.
Defeat a grade 5 Lightning Kirin in a hunt.
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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.
Feed a soul to Lv. 15 for the first time.
Complete "Secrets of Mt. Septem".
Complete "Perilous Ritual".
Complete "Resurrection of Orochi".
Complete "The Way of the Onmyoji".
Clear stage 10 of any Evo zone.
Win 10 duel.
Clear chapter 13 challenge in hard mode.
Feed 1 totem to Lv. 40.
Add 50 friends.
Clear chapter 9 challenge in hard mode.
Clear chapter 10 challenge in hard mode.
Clear chapter 12 challenge in hard mode.
Clear chapter 11 challenge in hard mode.
Win 1 duel.
Clear chapter 1 challenge in hard mode.
Make 50 donations in your guild.
Clear chapter 7 challenge in hard mode.
Complete "Upheaval".
Equip a grade 6 soul for the first time.
Clear chapter 8 challenge in hard mode.
Clear chapter 6 challenge in hard mode.
Find 20 shikigami shard zone.
Complete "Sakura and Momo".
Complete "An Unlikely Team".
Complete "The Drunken Deity".
Complete "The Red Maple Forest".
Complete "Another Seimei".
Complete "Bows and Arrows".
Complete "Dreamland Encounter".
Complete "Netherworld Rift".
Complete "Underworld Judgment".
Evolve 10 shikigami.
Evolve 20 shikigami.
Clear chapter 2 challenge in hard mode.
Clear chapter 3 challenge in hard mode.
Clear chapter 4 challenge in hard mode.
Clear chapter 5 challenge in hard mode.
Summon shikigami 100 times.
Summon an SSR shikigami.
Enter 20 shikigami shard zones.
Add 20 friends.
Receive 50 heart from a friend.
Receive 100 heart from a friend.
Own a grade 5 shikigami.
Win 50 realm raids.
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.
Evolve 1 shikigami.
Upgrade a shikigami for the first time.
Learn a new onmyoji skill for the first time.
Learn all skills of any 1 onmyoji.
Summon shikigami 10 times.
Summon an SR shikigami.
Find 1 shikigami shard zone.
Enter 1 shikigami shard zones.
Add 1 friends.
Receive 1 heart from a friend.
Login 1 day.
Login 2 day.
Login 3 day.
Login 4 day.
Login 5 day.
Login 6 day.
Login 7 day.
Login 8 day.
Login 9 day.
Login 10 day.
Own a grade 4 shikigami.