Starting with Winter’16 the SetupAuditTrail object is exposed to query from Apex.

For fields in the object, check the below link

https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_objects_setupaudittrail.htm

Sample SOQL:

List<SetupAuditTrail> listAudits = [SELECT Id, 
Action, 
CreatedBy.Name, 
CreatedDate, 
Display, 
Section 
FROM SetupAuditTrail 
WHERE CreatedBy.Email LIKE ‘%abc.com%’];