I’ve been to these countries (in chronological order, from first visit):
United States, Germany8, Netherlands, Switzerland2, France2, Italy3, Ireland, Monaco, the Vatican City*, Austria, Czech Republic2, Belgium, India, Turkey, Rwanda, Uganda, Kenya, South Africa, Great Britain2, Costa Rica, Senegal, Liberia, Australia, New Zealand2, Mexico4, Iceland, Morocco, Spain, United Arab Emirates, Singapore, Cambodia, Malaysia, Indonesia, Romania5, Slovakia, Hungary, Moldova7, Transnistria2**, Russia2, Belarus, Ukraine, Jamaica, Canada2, Poland, Finland, Egypt, Turks & Caicos, Denmark, Sweden, Norway, Namibia, Greece, and Cyprus.
Next up on the itinerary:
Portugal, Andorra, and Antarctica.
*I am aware the Vatican hardly counts.
**I am also aware that Transnistria (aka Pridnestrovia) is generally unrecognized except by Abkhazia and South Ossetia, however I had to go through passport control so I’m counting it.