getAllFields.txt

// SalesForce Apex Code


List<Schema.SObjectType> AllSobjects = Schema.getGlobalDescribe().Values(); // Getting All sObjects available.

List<String> AllSobjectsNames = new List<String>(); 
for(Schema.SObjectType sObj : AllSobjects) {
    AllSobjectsNames.add(sObj.getDescribe().getName());
}   // Getting All sObjects Names available.

System.debug(' **Total sObject Count: ' + AllSobjectsNames.size());

SObjectType acc = Schema.getGlobalDescribe().get('Account'); // Account sObject is just hardcoded here..Can use any sObject Name.
Map<String,Schema.SObjectField> allFields = acc.getDescribe().fields.getMap(); //All fields as a map.

System.debug(' **Total field Count: ' + allFields.size());

for(String sfield : allFields.keyset()) {
    System.debug('--> '+ allFields.get(sField));
}