How do I apply that ACL to the interface? I can't find the command.

access-group "access list name" in interface outside

Just add the following to your outside interface:

access-list permit icmp any any echo-reply

access-list permit icmp any any unreachable

access-list permit icmp any any time-exceeded

access-group in interface outside

** can be anything you want for the outside interface**

save with write mem and also issue claer xlate

pls rate posts if it helps.