Here is the full list of all 43 Deathsmiles I・II achievements.
Defeat Tyrannosatan, the Demonic Imperator!
Defeat Jitterbug, He who Opens the Door!
Defeat Bavaria, the God of Flames!
Defeat Mary, the Giant Cow!
Defeat Sakura, Witch of the Swamp Wastes!
Defeat Whroon, Conjurer of the Forest!
Defeat Jordan, the Buried Baron!
Defeat Deathscythe, the Wandering Reaper!
You have obtained all of the achievements.
Defeat Devaria and Givaria, the Twin Wyrms!
Select Level 3 five times while playing. (Arcade, Normal only)
Clear the Gorge and Hades Castle having selected Level 3 for all stages. (Arcade, Normal only)
Clear the game. (no continues. Arcade, Normal only)
Clear Deathsmiles Version 1.1 with all maps at Level 3! (no continues, incl. EXMAP)
Reach a score of 100,000,000 points. (Arcade, Normal only)
Reach a score of 200,000,000 points. (Arcade, Normal only)
Reach a score of 300,000,000 points. (Arcade, Normal only)
Reach a score of 10,000,000,000 points. (MBL Ver. 1.1 only)
Defeat Lily in either Arcade or IIX Mode at any level.
Defeat Bigote in either Arcade or IIX Mode at any level.
Defeat Heavy Snake in either Arcade or IIX Mode at any level.
Defeat Tamecos in either Arcade or IIX Mode at any level.
Defeat Tartaros in IIX Mode at any level.
Defeat Mad Teddy & Mad Bunny in IIX Mode at any internal rank.
Defeat Satan Claws in Arcade or IIX Mode at any level.
Clear the game in either Arcade or IIX Mode at any level.
Reach a score of 1,000,000,000 points in IIX Mode.
Throw a Familiar at any level.
Clear Arranged Mode without continuing at any level.
Stay in Power-up Mode for more than 60 seconds at any level.
Maintain Fever Mode for more than 60 seconds at any level.
Make 1,024 items of any type appear at any level.
Defeat Pigeon Blood Jitterbug.
Select Level 3 for all stages, and clear Lost Paradise and Chateau in IIX Mode. (no continues)
Reach a score of 4,000,000,000 points.
Reach a score of 6,000,000,000 points in IIX Mode.
Clear the game using Ranun without continuing.
Clear the game using Rosa without continuing.
Clear the game using Souffle without continuing.
Clear the game using Cattleya without continuing.
Clear the game using Plumeria without continuing.
Defeat a boss while in Power-up Mode.