Tales of Vesperia

This achievement unlocks if all in your party are level 14 or less when you regain control of your characters outside Ghasfarost after the fight with Barbos. That is when the achievement pops.

After you have completed your first game, and hopefully found all weapons and armor in the game you can start a EX new game. At the grade shop I would recommend:

Max 99 Items (Grade 400)
- This one will help you not to use up all your Holy bottles when you are in the field/dungeons. (Unless you want to run away from all battles)

Items (Grade 500)
- Extremely important. You keep all weapons, armor etc from your previous game.

Craft skill (Grade 10)
- Needed so you can synthezise Winged Boots as soon as possible.

Gald (Grade 1000)
- Unless you already got a full inventory of Holy Bottles, this one comes in handy so you always keep a full stock, especially if you want to explore a little bit of the world as you go. (And if you are playing on a higher difficulty you might need to add health items to your inventory)

Artes (Grade 1000)
Skills (Grade 1000)
Skill SP 1 (Grade 3000)
- All previously learnt Skills and Artes makes those few battle you have to fight a walk in the park. And with the SP1 perk, you will be able to use 9-14 skills in the final battle. Vitality, Defence, Strenght, it all helps.

Increase Max HP (Grade 500)
Increase Max TP (Grade 500)
- 20% more HP and TP.

Increase Over Limit (Grade 1000)
- The Overlimit gauge filles twice as fast

1/2 Experience (Grade 10)
- The most important item to buy. It is probably not possible to do this achievement with a normal amount of experience.

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IMPORTANT: You will probably not want to continue with this game after you have defeated Barbos, so do not save over your completed game file, or else you will lose everything. Either don't save at all, or keep it in a separate file.

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As you progress with the story always remember.
1: Always equip your character with the best weapons and armor in your possession. Do this everytime you meet a new character.

2a: Use Holy Bottles frequently. You'll see it when it wears off.
or
2b: Escape from all random battles. Put all on Defence, and pick Escape from the Battle Menu. Karol also have the Run Skill which makes escaping faster.

(I would recommend 2a, since then you don't have to change the Battle Strategy between boss battles, and it's a lot quicker)

3: If you want as low level as possible, always switch out the character with the most experience from the active party. And don't equip any EXP Share, Happiness or other experience boosting skills.

4. As soon as you get to Halure you should synthesize the Valuable Winged Boots. These make you run faster everywhere.

If you only do those neccessary ones all characters will be level 11 when facing Barbos, except Karol who was at 9. This means that you do have some room for error, but don't get closer than about 1200 exp from level 15 depending on how many of Barbos' henchmen you have to face. (You will get 1000 from Barbos himself)

With all characters maxed out with their equipment and skills the bosses will actually not manage to be any kind of threat. Actually with characters at level 9-11 Barbos still only managed to do 1 damage with his strikes.

Difficulty is Easy by the way, but since this seems to be a riskfree solution, you might want to play on a higher difficulty just to get a challenge. You still would have almost unlimited with health items so the risk would still be low. Then I also would recommend the Resurrect/Angel's Tear skills.

To do this you must defeat Barbos, the final boss of Part 1 at level 15 or under.To do this, you MUST have the grade shop perk that reduces amount of exp earned to 1/2. It's recommended to have the Skill SP 1 perk, and as many/all skills and artes for any characters you plan to use. Use holy bottles to avoid any unnecessary battles, and of course equip your party as best as you can. Of course, using perks like 99 items will help, but aren't really necessary. When you get to Barbos obviously go after the cogs immediately to avoid getting overwhelmed, use Rita's Tidal Wave to keep enemies immobile, and this battle should go by quickly and easily. You will likely be either level 12 or 13 when you beat Barbos.