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