Soulcalibur IV

The quickest way to get this achievement is to enter create-a-character mode, from there select Mitsurugi, create a new form and don't edit an already existing version of him. The reason we're using Mitsurugi is because you don't need to level him up at all, you can get this achievement using him from his starting level.

And now rather then list out what items of clothing to dress your character in and which skills to assign him, I've linked in a video which shows and tells you exactly what to do!

* ^{Credit to RoosterTeeth for the video}

Go to create a character, and choose Male, then Siegfried(Make sure your Siegfried is at least Level 3) for the style and Soul Calibur (2P is what I used). Then equip Monocle(Left Eye), Dueler' Necklace, Executioner's Spaudlers, Usurper's Suit, Worker's Shirt, Dueler's Breeches, and Caretaker's Boots. After, put the skills on Shave Damage C, Impact Heal, Start Dash C, and Nullify Ring Out C.

- Pick Mitsurugi - Needs to be at least level 3!
- Weapon: MasaMune
- Unequip all attire so he is naked, then equip the following:
+ Hero's Band on his head.
+ Lord's Mantle on his neck.
+ Protective Tattoo on his body
+ Warrior's Kimono on his upper body.

- Then Equip the following skills:
+ Shave Damage C
+ Hysterical Strength,
+ Auto Grapple Break C
And you should have a skill on from the MasaMune, then finish and save.

Done.

Much like those above me, I was able to come up with a design that worked perfectly to get this achievement, if it's a tad more expensive in gold to get. For this, You must use Siegfried at Level 5. I'll admit, after fighting with him in all this gear, he actually is quite potent anyway with all his Skill Settings and Gear.

Here're the Skill Settings:
1st - Venom Fang C
2nd - Impact Edge
3rd - Start Dash B
4th Soul Gauge Damage B

Here are the armor pieces he must be wearing to obtain the right numbers for the Skill Settings:
Head - Soldier's Hat/Viking Helm (both do no skill setting increases, I use the hat)
Eyes - Monocle (Right Eye)
Neck/Cape - Embroidered Cape
Shoulders - Paladin's Pauldrons
Undergarments - Chain Mail
Upper Body - Paladin's Cuirass
Arms - Paladin's Gauntlets
Lower Body - Paladin's Fauld
Ankles - Bandages
Legs - Paladin's Greaves

There ya go, yet another way to get the achievement.