Here is the full list of all 50 Deathsmiles achievements worth 1,000 gamerscore.
Cleared Deathsmiles Version 1.1 with all maps at Lv3! (No Continues, Ex Map included）
Score has reached 200,000,000 points. (Secret Achievement) Xbox 360 / Arcade
Cleared the game using Casper without continuing. Xbox 360 / Arcade
Cleared the game using Windia without continuing. Xbox 360 / Arcade
Cleared the game using Follett without continuing. Xbox 360 / Arcade
Chose to stay in Gilverado with Sakura.(Secret Achievement) MBL
Score has reached 100,000,000 points. (Secret Achievement) Xbox 360 / Arcade
Cleared the game using Rosa without continuing. Xbox 360 / Arcade
Chose to stay in Gilverado with Casper. Xbox 360 / Arcade
Chose to stay in Gilverado with Rosa. Xbox 360 / Arcade
Chose to stay in Gilverado with Follett. Xbox 360 / Arcade
Score has reached 10,000,000,000 points in Mega Black Label 1.1 mode.
Chose to stay in Gilverado with Windia. Xbox 360 / Arcade
Waited for Sakura to explode while playing as Windia. (Secret Achievement) Xbox 360 / Arcade
Cleared any stage with 0.5 lives and 0 bombs. (Secret Achievement) Xbox 360 / Arcade
Chose to stay in Gilverado with Sakura. MBL
Defeated Ozier. MBL
Powered up at 500. MBL
Returned Windia to the real world. Xbox 360 / Arcade
Cleared the game with all characters. Xbox 360 / Arcade
Cleared the game with Windia. Xbox 360 / Arcade
Cleared the Gorge and Hades Castle having selected Lv3 for all stages. Xbox 360 / Arcade
Picked up 4 life-recovery items in one playthrough. (Secret Achievement) Xbox 360 / Arcade
Defeated Devaria and Givaria, the Twin Wyrms! Xbox 360 / Arcade
Selected Level 3 five times while playing. Xbox 360 / Arcade
Returned Casper to the real world. Xbox 360 / Arcade
Cleared the game with Casper. Xbox 360 / Arcade
Returned Rosa to the real world. Xbox 360 / Arcade
Cleared the game with Rosa. Xbox 360 / Arcade
Cleared the game without using any bombs. Xbox 360 / Arcade
Cleared Deathsmiles Version 1.1!
Moved your demon friend! Ver 1.1
Returned Follett to the real world. Xbox 360 / Arcade
Cleared the game with Follett. Xbox 360 / Arcade
Defeated Tyrannosatan, the Demonic Imperitor! Xbox 360 / Arcade
Defeated Jitterbug, He who Opens the Door! Xbox 360 / Arcade
Defeated Bavaria, the God of Flames! Xbox 360 / Arcade
Defeated Mary, the Giant Cow! Xbox 360 / Arcade
Defeated Sakura, Witch of the Bog Wastes! Xbox 360 / Arcade
Defeated Ulan, Conjurer of the Forest! Xbox 360 / Arcade
Pressed the pause button during a stage. (Secret Achievement) Xbox 360 / Arcade
Returned Sakura to the real world. MBL
Cleared all 6 chapters at level 999 (continue may be used). MBL
Chose Level 999 once. MBL
Defeated Jordan, the Buried Baron! Xbox 360 / Arcade
Continued once while playing. Xbox 360 / Arcade
Defeated Deathscythe, the Wandering Reaper! Xbox 360 / Arcade
Played any mode once. Xbox 360 / Arcade
Score has reached 300,000,000 points. (Secret Achievement) Xbox 360 / Arcade
Defeated Bloody Jitterbug. MBL