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