AboutUsModel.cs

public class AboutUsModel : RenderModel
    {
        public IPublishedContent MainImage { get; }
        public string MainImageUrl { get; }

        public AboutUsModel(IPublishedContent content)
            : base(content)
        {
            MainImage = Content.GetHeaderImage("mainImage");

            MainImageUrl = MainImage.Url.GetCropUrl(width: 1200).EnsureRelativeUrl();
        }
    }

aboutUsPage.cshtml

@using Archetype.Extensions
@using Archetype.Models
@using Umbraco.Web
@inherits Umbraco.Web.Mvc.UmbracoViewPage<KGLLC.OakGrove.Models.AboutUsModel>
@{
    Layout = "~/Views/OakGrove/Base.cshtml";
}

<div id="about-us-parallax" class="parallaxModule title" data-parallax="scroll" data-image-src="@Model.MainImageUrl">
    <div class="container">
    </div>
</div>

<div class="container margin-top-20">
</div>

@Html.RenderArchetypePartials(Model.Content.GetPropertyValue<ArchetypeModel>("modules"), "~/Views/OakGrove/Partials/Archetype/")

<div class="container margin-bottom-20">
</div>

OakGroveAboutUsPageController.cs

using System.Web.Mvc;
using KGLLC.OakGrove.Models;
using Umbraco.Web.Models;
using Umbraco.Web.Mvc;

namespace KGLLC.OakGrove.Controllers
{
    public class OakGroveAboutUsPageController : RenderMvcController
    {
        public override ActionResult Index(RenderModel model)
        {
            return View("~/Views/OakGrove/OakGroveAboutUsPage.cshtml", new AboutUsModel(model.Content));
        }
    }
}

richtextModule.cshtml

@using KGLLC.Umbraco.Common.Extensions
@inherits Umbraco.Web.Mvc.UmbracoViewPage<Archetype.Models.ArchetypeFieldsetModel>

<section class="container richtext-module">
    <div class="col-md-12">
        @Html.Raw(Model.GetValue<string>("text"))
    </div>
</section>

OakGroveAboutUsPage is the document type alias.

ArchetypeFieldsetModel class the Archetype partial should inherit.

@Html.RenderArchetypePartials(Model.Content.GetPropertyValue<ArchetypeModel>("modules"), "~/Views/OakGrove/Partials/Archetype/") <== modules is the document type property alias name.

"~/Views/OakGrove/Partials/Archetype/" is the path to the partials.

text is the Archetype property alias.

richtextModule is the fieldset alias for an Archetype.