Here is the full list of all 53 Shine's Adventures 4 (Nightmare) achievements.
Get Brilliant Ruby
Get Devil's Claw
Get Nightmare Claw
Get Gorgeous Lapis Lazuli
Get Nightmare Wings
Get Brilliant Agate
Get Doom Blast
Get Primal Blessing
Get Druid's Crystal
Get Devil's whisper
Get King's Tears
Get Brilliant Lapis Lazuli
Get Cunning crystal
Get Inlaid with topaz skirt
Get Glowing purple skirt
Get Charm
Get Brilliant Aventurine feldspar
Get Nightmare's Gate
Kill the 7th BOSS
Kill the final BOSS
Get Nightmare Horn
Get Little Devil's Gift
Get Gorgeous Ruby
Kill the 9th BOSS
Get Gorgeous Sapphire Crystal
Get Dark Star
Get Inlaid with ruby skirt
Get Cat ears
Get Savior's Glory
Get Brilliant Sapphire Crystal
Kill the 8th BOSS
Get Devil's Wings
Get Glowing yellow skirt
Get Gorgeous Agate
Get Red Devil's Horn
Kill the 4th BOSS
Get Magister's Regalia
Get Gorgeous Aventurine feldspar
Get Slightly glowing green vest
Get Rebirth of blue crystal
Get Dreamwalker
Get Glowing headdress
Kill the 2nd BOSS
Kill the 6th BOSS
Get Eternal Staff
Get Inlaid with red crystal of tight clothing
Get Devil Minions
Kill the 3rd BOSS
Get Glowing green vest
Kill the 5th BOSS
Get Wisdom Staff
Get Inlaid with red crystal vest
Kill the first BOSS