These foods/drinks grant no buff, only restore health (food) or mana (drinks).
The food and drink with the highest level requirements for the aforementioned achievement are Морской хот-дог and Саспарилья (both require level 85). As such, this achievement cannot be completed before a character reaches that level.

The various Darkmoon foods are as follows:

Level Requirement	Food	Level Requirement	Food
1	Хот-дог Новолуния	45	Поджаристый шоколадный батончик
5	Острая бастурма	65	Рулет
15	Маринованная ножка кодо	75	Сосиска в кукурузных сухариках
25	Крылышки с красным перцем	75	Жареная ножка лесного долгонога
35	Хрустящая лягушка	85	Морской хот-дог

The various Darkmoon drinks are as follows:

Level Requirement	Food	Level Requirement	Food
1	Дешевое пиво	55	Морс из мороженой ягоды
1	"Особое Новолунное"	70	Свежевыжатый лимеад
15	Ярмарочная шипучка	70	Шипучий энергетический напиток "Классик"
35	Бутылка талой воды	85	Саспарилья

Obtaining Darkmoon food/drink

Fishing
Found in Заколоченный ящик ярмарки Новолуния. Random foods/drinks are contained in these crates, so if you are looking to obtain every one for the achievement, it will be RNG dependent. Note that there are 2 foods and 2 drinks that CANNOT be found in the Заколоченный ящик ярмарки Новолунияs, and must be purchased from the vendors. These are Жареная ножка лесного долгонога, Рулет, Морс из мороженой ягоды and Шипучий энергетический напиток "Классик".
These crates can be fished up from pools of Shipwreck Debris around Darkmoon Island, or rarely can be fished up from open water. Each successful cast into a Shipwreck Debris pool will yield 1 Заколоченный ящик ярмарки Новолуния as well as roughly 2-5 Острозуб Новолуния. Pools usually despawn after 1-2 casts.
Each crate contains 1 guaranteed Огненная вода Новолуния, a random assortment of Darkmoon elixirs, and various random Darkmoon foods/drinks.
Vendor
Darkmoon foods are purchased from vendor Стомп Громовой Рог (southeast of the Tonk Challenge pavilion at 53,69), while Darkmoon drinks are sold by Силанния (the small tent just south of the Tonk Challenge pavilion at 50,69). Prices for the food/drinks vary from 10 copper to 2 gold.