Q:

What does "like few others" mean?

I don't really know about the meaning of "like few others" in the first sentence:

AMP is an organisation like few others. We enjoy a culture that recognises individuality yet encourages collaboration, giving real meaning to our work and making a difference to our people and our customers.

And there's the second sentence I saw online:

This was some beautiful morning and what a job they’ve done, like few others have been able to do.

Comparing these two sentences, I don't know if the use of this phrase are the same. Please teach me if you know anything about it. 

A:

Literally, this phrase means "unusual," since "like few others" is logically the same as "unlike most others."  That is, the person or thing you are talking about is not similar in some way to the other people or things that are in the same category. 
In addition to that literal meaning, the phrase like few others is almost always used in a positive sense.  Not only is this person or thing unlike most others, they are also better in some way than most others.  So your example: 

...what a job they’ve done, like few others have been able to do.

can be read to mean the same as:

...they have done a better job than most other people could do. 

A:

When X is like few others, it usually means X is among an exclusive or difficult-to-achieve upper rank of something.
The two examples you provide are the same.  The first is being used in a corporate marketing sense, so AMP may in fact be like a lot of other organizations, but the text is trying to entice potential candidates with flowery language.

