Here is the full list of all 36 Trillion: God of Destruction achievements.
Defeated Trillion with one of the first three Overlords!
Defeated Trillion in its Final Form!
Defeated Trillion in its Dragon Form!
Broke through Trillion's outer armor!
Defeated Trillion in its Titan Form!
Opened up all the Demon Seal slots!
Strengthened a weapon by +30!
Strengthened a weapon by +10!
Reached the MAX level in a relationship!
Inflicted 10 billion damage with one hit!
Got 100,000G!
Defeated Mokujin with one hit!
Gave someone the best present ever!
Amassed a variety of Active Skills!
Amassed a variety of Passive Skills!
Leveled up a skill to the max!
Executed Fever Time for the first time!
Gave a present for the first time!
Used Interact for the first time!
Challenged the Valley of Swords for the first time!
Used Order for the first time!
Powered up a weapon or opened up a slot!
Performed a stat increase for the first time!
Trained for the first time!
Obtained every trophy!
Watched all the lovey-dovey endings!
Cleared Challenge Mode!
Watched the true ending!
Began a second playthrough!
Watched everyone's hot springs event scenes!
Affection Points have surpassed 1 billion!
Used every Death Skill!
Completed all entries in the Gift Guide!
Unlocked "Holy Illusion"!
Executed Double-Up for the first time!
Retreated for the first time!