Post traumatic stress disorder can come from any type of stressor, right?

Life-threatening. Posttraumitic stress disorder by definition require that a life-threatening stressor that is re-experienced. Patient's develop flashbacks, nightmares, hyper-arrousal with avoidance of situations that remind the person of the trauma. Even after successful treatment, a person can redevelop symptoms of the initial stressor if they re-experience another traumatic stressor.
Not exactly. The diagnostic criteria for PTSD don't cover all stressors. The stressor needs to be pronounced, & outside the typical realm of human experience, and it typically involves something that is life-threatening or some sort of significant violation/physical threat to you or someone you are with. You can still experience a significant stress response even if it is not PTSD.
PTSD occurs. Much about what the actual stressor is - but rather how it impacts the individual. If it creates a sense of horror or intense fear that may in some individuals lead to a post traumatic response. What is traumatic in the eye of the one individual may not be experienced that way by another. For instance, when i was a diver, swimming with sharks was frightening but not traumatizing for me.
PTSD. Post Traumatic Stress Disorder can indeed come from any stressor. That said, it is typically a stressor that made a big impression on you. What can cause PTSD in one person might not be a big deal at all to another person. .
PTSD. It typically comes from relatively significant stressors... those considered to be traumatic, but it can be a stressor of wide variety. PTSD can happen from being assaulted, from witnessing violence or a traumatic event, from being involved in an accident or other traumatic event. These are just a few stressors that can trigger PTSD.
PTSD requires trauma. involving exposure to actual or threatened death, serious injury, or sexual violence by directly experiencing it, witnessing it, learning it occurred to a close family member or close friend, or repeated or extreme exposure to details of the trauma. It causes intrusive memories/reactions, avoidance of reminders, & changes in thinking, mood, arousal, & reactivity that last at least a month.