Here is the full list of all 51 Disgaea 5 Complete achievements.
Condition：Obtain all other trophies.
Obtain the legendary weapon in the Item World. "Only the chosen one can equip it..."
Get 50 One Time Bonuses. "You're taking all the bonuses!"
Deal over 10,000,000,000 damage. "Blow 'em away!"
Conquer the Carnage Dimension. (Defeat Carnage Dark) "This is the ultimate power!"
Max out an item's level. "Annihilate enemies with the weapons you've modified!"
Obtain an epic item. "This is sweet!"
Discover 100 Netherworlds. "Find new frontiers!"
Experience the effects of the hot springs in an Item World Mystery Room. "No peeking on the girls' side."
Defeat Proto Darkdeath in the Item World. "Wh-Who is this guy...!?"
Perform 20 combos. "Finish 'em off all at once!"
Obtain more than 10,000,000,000 HL. "So, whatcha gonna blow it all on?"
Unlock all character classes. "Master every path possible!"
Reach the goal in the Chara World on Super Overlord difficulty. "It takes a lot of gaming to get this far."
Enter the Carnage Dimension. "We can't lose to the overwhelming power of Carnage!"
Level up to Lv 9999. "It's just a destination, not the final stop!"
Pass a bill that gives you a Trophy. "Yes, you earned it."
Pass a bill by Paying Up 100,000,000 HL. "I hope it's worth it!"
Reach the goal in the Chara Word. "Congratulations!"
Eat curry for 100 days straight. "They're demons so they're fine. Please don't try this at home."
Clear Final Ep.: Dedicated to the Precious People. "I'll save her, no matter what!"
Hit allies inside the base 100 times. "Be gentle."
Clear Ep. 15: The Ultimate Skill. "Excellent..."
Clear Ep. 14: Seraphina's Secret. "A girl in love is invincible!!!"
Nullify all Geo Panels with a Geo Chain of 5 or more. "Find the trick and erase all of them at once!"
Clear Ep. 13: The Two Killias. "...Yeah, farewell."
Clear Ep. 12: Unbridled Killia. "The one who leaves destruction in his wake."
Clear Ep. 11: Netherworld Extinction. "They are all irreplaceable."
Clear Ep. 10: The Memorable Special Sweet Curry. "Our...beloved daughter..."
Repel a Netherworld in the Item World. "Just another day for you and me in the Netherworld."
Achieve a population of 100 in the pocket Netherworld. "The pocket Netherworld has gotten pretty crowded."
Clear Ep. 9: The New Power. "Guuurrryaaahhh!!!"
Call your Netherworld for the first time. "If you call it...it will come."
Capture 100 prisoners. "Round them up!"
Clear Ep. 8: Past Struggles Part 2. "Master!!!"
Jump 1,000 times at the base. "Once you hop, you just can't stop."
Get a Game Over. "Let this humiliation fuel your strength."
Force the Dark Assembly to approve a bill. "In the end, it's all about the 'Aye.' "
Clear Ep. 7: Past Struggles Part 1. "Bro!"
Clear Ep. 6: The Sixth Warrior. "Dance of the Bristle Grass!"
Activate Revenge Mode 100 times. "Your hatred makes you powerful!"
Clear Ep. 5: The One Who Controls Death. "Kill and Recycle!"
Clear Ep. 4: Yellow, Rabbit, and Curry. "I want curry, I want curry, I want curry, I want curry..."
Watch 20 skits. "Enjoy the daily lives of demons."
Clear Ep. 3: His Name is Zeroken. "A silver white shadow that creates a storm..."
Perform a Combo Skill for the first time. "This is the power of bonds!"
Complete 20 quests. "We'll accept any quest."
Clear Ep. 2: Demon General. "Madam Seraphina, hooray!"
Completely fill the Bonus Gauge. "Take everything!"
Clear Ep. 1: Prelude to Vengeance. "The story of rebellion starts now!"
Use an Overload skill for the first time. "Watch closely for the power of an Overlord."