For temperature you could use the TMP36, which you can power at 3.3v. It then supplies an analog output that the 3.3v analog pin on Automation HAT could read.
I believe all the humidity/pressure sensors we stock are on i2c breakouts- meaning they would run quite happily alongside Automation HAT .
Our Hydrogen/LPG and Carbon Monoxide sensors also output an analog signal, but due to the voltage divider that makes the other 3 analog pins on Automation HAT 24v tolerant you might have trouble getting a good reading out of them.
The 24v ADC pins actually take 0v to 25.85v, dividing that down to 0-3.3v. That means if your sensor outputs 0-5v then only one fifth of the usable range of the ADC is used. Since it’s an 11bit ADC (if i remember correctly) which has a full range of 0-2047 that means you can only read about 409 possible values from a 5v analog sensor on these pins.
Depending on the sensitivity of the sensor, and the range at which the property you’re measuring varies, this might not be so useful!
TLDR: You can only really use one 3.3v analog sensor on Automation HAT unless you don’t mind losing precision or getting really technical!
i2c sensors, though, you can use dozens- theoretically- as long as they’re wired into the i2c bus and have a unique address.