See AtomSetup project.

1. Install the package-sync package.
2. Run the Package Sync: Create Package List command.
3. Run the Package Sync: Open Package List command.
4. Compare with list below and update as necessary.
5. Run the Package Sync: Sync command. Note that this will not remove packages.

packages: [
  "atom-alignment"
  "emmet"
  "language-cshtml"
  "minimap"
  "open-recent"
  "package-sync"
  "pigments"
  "set-syntax"
]

Look in C:\Users\stephenh\.atom\config.cson.

"*":
  core:
    disabledPackages: [
      "git-diff"
      "language-c"
      "language-clojure"
      "language-gfm"
      "language-git"
      "language-go"
      "language-java"
      "language-less"
      "language-make"
      "language-mustache"
      "language-objective-c"
      "language-perl"
      "language-php"
      "language-python"
      "language-ruby"
      "language-ruby-on-rails"
      "language-sass"
      "language-shellscript"
      "language-toml"
      "language-yaml"
      "wrap-guide"
    ]
    telemetryConsent: "limited"
  editor:
    lineHeight: 1.2
    scrollPastEnd: true
    showInvisibles: true
    tabLength: 4
  "exception-reporting":
    userId: "3262335c-cd13-59da-e7bc-9eedc1a1c87f"
  minimap: {}
  "package-sync":
    createOnChange: true
    forceOverwrite: true
  pigments:
    markerType: "dot"
  welcome:
    showOnStartup: false