Here is the full list of all 121 Onmyoji achievements.
Clear chapter 17 challenge in hard mode.
Clear chapter 12 challenge in hard mode.
Feed a soul to Lv. 15 for the first time.
Clear chapter 16 challenge in hard mode.
Feed soul 100 times.
Clear chapter 1 challenge in hard mode.
Make 50 donations in your guild.
Complete "Perilous Ritual".
Complete "Resurrection of Orochi".
Clear chapter 15 challenge in hard mode.
Defeat a grade 5 Lightning Kirin in a hunt.
Defeat a grade 5 Wind Kirin in a hunt.
Clear chapter 14 challenge in hard mode.
Receive 100 heart from a friend.
Complete "The Way of the Onmyoji".
Clear chapter 13 challenge in hard mode.
Win 10 duel.
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".
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".
Complete "Upheaval".
Activate any 4-piece soul set stat.
Equip a grade 6 soul for the first time.
Evolve 1 shikigami.
Evolve 10 shikigami.
Evolve 20 shikigami.
Upgrade a shikigami for the first time.
Learn a new onmyoji skill for the first time.
Learn all skills of any 1 onmyoji.
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.
Clear chapter 6 challenge in hard mode.
Clear chapter 7 challenge in hard mode.
Clear chapter 8 challenge in hard mode.
Clear chapter 10 challenge in hard mode.
Clear chapter 11 challenge in hard mode.
Summon shikigami 10 times.
Summon shikigami 100 times.
Summon an SR shikigami.
Summon an SSR shikigami.
Find 1 shikigami shard zone.
Find 20 shikigami shard zone.
Enter 1 shikigami shard zones.
Enter 20 shikigami shard zones.
Win 1 duel.
Add 1 friends.
Receive 1 heart from a friend.
Receive 50 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.
Defeat a grade 5 Water Kirin in a hunt.
Own a grade 5 shikigami.
Own a grade 4 shikigami.
Win 50 realm raids.
Complete "Secrets of Mt. Septem".
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 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 9 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 20 friends.
Add 50 friends.
Defeat a grade 5 Fire Kirin in a hunt.
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Own a grade 6 shikigami.
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.