Requires:

{
  "enemyKill": {
    "enemies": [
      [
        "Green Space Pirate (standing)",
        "Green Space Pirate (standing)",
        "Green Space Pirate (standing)"
      ]
    ]
  }
}
{
  "or": [
    {
      "enemyKill": {
        "enemies": [
          [
            "Mini-Kraid"
          ]
        ],
        "excludedWeapons": [
          "PowerBeam",
          "Ice",
          "Wave",
          "Spazer",
          "Bombs",
          "Charge"
        ]
      }
    },
    {
      "and": [
        {
          "enemyKill": {
            "enemies": [
              [
                "Mini-Kraid"
              ]
            ]
          }
        },
        {
          "or": [
            "canDodgeWhileShooting",
            {
              "enemyDamage": {
                "enemy": "Mini-Kraid",
                "type": "stone",
                "hits": 1
              }
            }
          ]
        }
      ]
    }
  ]
}

Clears obstacles: A