Seems like a lot of the Atari games you can beat are... complicated.

I remember when we beat Raiders of the Lost Ark for the first time.  Parachuting into the cave after missing numerous times.  A bunch of 12 year-olds screaming in celebration at 3 am.  Only to get scolded by the parents after waking them up.  It was worth it.

You forgot about Haunted House - it has several difficulty levels, a clear objective, and jump scares that even now can rival modern games.

I believe Krull, Gremlins and Ghostbusters had endings as well

I loved the ET game, sent ET home several times. The ending screen sees a saddened Elliot walk around his house screen.
The end of the Journey game gave you the scarab ship breaking free and a few bars of Don't Stop Believing', and I thought that was the coolest thing back then.
We had a copy of Raiders but we didn't have an instruction book so we didn't know what to do with it.
Completely agree on Solaris and Star Master, two of my favorites.

I played Pitfall 2 for weeks until I was able to beat it with a perfect score. Find everything without getting touched once. Even now, years later, I'm still proud of that. :)

Pitfall 2 was one of the first games I ever played that made me feel like I was exploring a place. It was majorly mind-expanding; a real revelation. Sending away for the Cliffhangers Club patch was my first real gaming accomplishment.  I got to meet David Crane in person last fall and gush to him all about it. He was remarkable patient and signed some sweet Pitfall wooden wall art for me. It was an amazing moment.

Great video. Haunted House and Superman also have endings.

ET is actually quite easy. And honestly is much more fun than Raiders. I've beaten ET too many times to count now.

You forgot "Superman".  You have to capture Lex Luthor and his henchmen and put them all in jail again.

Hey! As a pre-teen, I loved the Indiana Jones game for the Atari 2600. When playing, I purposely avoided consulting the booklet, in order to boost the difficulty.  And the game was often maddeningly hard, with countless swaps required, along with the entire multi-screen maze requiring all tasks to be performed in precisely the correct order and many at exactly at the right game-times.

Perhaps the super-gamers who are prevalent today could easily whip through the adventure in six or seven hours, knowing the tropes used in this kind of game. It took me and my best friend several days, but half of this time was spent laughing hysterically at the horrific graphics, the sluggish control response, the super-annoying music, and the fact that Indy’s progress could not be saved. With all of its shortcomings, it was a change of pace from Asteroids or Pac Man, and it required real mental flexibility to win. It was a superior game.

I played Raiders for weeks on end back in 82. When you look at it today, well it's a 40 years old looking game but back then it was just amazing, to me it was anyway.

"Superman" have a proper ending too. I beat it several times on my Atari in the old days. If I remember correctly, you must rebuild the bridge, put all the criminals in jail, transform back to Clark Kent in the phone booth and then walk inside the Daily Planet building.

Star Raiders (1979)  on Atari computer was the first killer app.

Raiders of the lost ark was the game I felt in love with adventure genre. I remember when me and a friend spend hours playing eventually getting to the end. It meant the world at that time.

I used to complete ET when I was a kid. And I figured out how to avoid falling back into the pits in about 10 minutes. I don't know what all the fuss was about, it's quite a fun game. Try starting on game 3 as you can learn how the game works without the scientist and FBI guy following you around.

Neubauer's 1979 Star Raiders was for the Atari 8-bit computers. The 2600 port was by Carla Meninsky and released in 1982.
The original Star Raiders was a groundbreaking game--this whole genre of games like Starmaster and Solaris, and arguably Elite, Wing Commander and X-Wing, is derived from it. (Though Star Raiders itself can be seen as a fusion of the old text-based Star Trek games for 1970s mainframes, and simple first-person space shooters like Starship One.)

Space Shuttle was another game with an ending.

Also, in Pitfall 2 the treasure in the very upper right hand screen on the map must be retrieved before dropping into the cave as there's no way back up.

Raiders was such a great game because it was like a puzzle. We would just ask other kids at school how they beat a certain level and then go home and continue. That is how we played. The fun was the frustration in trying to figure it out.

I love Star Raiders! Beaten it on a few difficulties.