String type='Account'; // to make it dynamic. you can send this value in initial of method

Map<String, Schema.SObjectType> schemaMap = Schema.getGlobalDescribe();
Schema.SObjectType leadSchema = schemaMap.get(type);
Map<String, Schema.SObjectField> fieldMap = leadSchema.getDescribe().fields.getMap();

for (String fieldName: fieldMap.keySet()) {
System.debug('##Field API Name='+fieldName);// list of all field API name
System.debug(fieldMap.get(fieldName).getDescribe().getLabel());//It provides to get the object fields label.
}